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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) of this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Charlotte Montressor Willis."}],"balance_after":40280,"source":{"system":"sec-edgar","filing":"0000905148-26-004063","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1033309/000090514826004063/form4.xml","form_type":"4"}},{"id":674184,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-26","kind":"sale","planned":true,"acquired":false,"shares":15600,"price":55.1139,"value":859776.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $54.62 to $55.58, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":2492143,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":674183,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":113,"price":56.05,"value":6333.65,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."}],"balance_after":2507743,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":674182,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":11287,"price":54.4972,"value":615109.8964,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $53.91 to $54.90, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":2507856,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":677940,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-24","kind":"sale","planned":true,"acquired":false,"shares":13684,"price":55.232,"value":755794.688,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $55.03 to $55.53, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (6) of this Form 4."}],"balance_after":2519143,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677939,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-24","kind":"sale","planned":true,"acquired":false,"shares":3016,"price":54.5876,"value":164636.2016,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $53.98 to $54.95, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":2532827,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677938,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":1100,"price":54.7891,"value":60268.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $54.73 to $54.87, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":2535843,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677937,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":12400,"price":54.4412,"value":675070.88,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $53.72 to $54.71, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":2536943,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677936,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-20","kind":"sale","planned":true,"acquired":false,"shares":116,"price":54.66,"value":6340.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."}],"balance_after":2549343,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677935,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-20","kind":"sale","planned":true,"acquired":false,"shares":16184,"price":53.9772,"value":873567.0048,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $53.40 to $54.32, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":2549459,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":681984,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":4810,"price":57.2701,"value":275469.181,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"This transaction was executed in multiple trades at prices ranging from $57.03 to $57.95, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (11) of this Form 4."}],"balance_after":2565643,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681983,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":3133,"price":56.4812,"value":176955.5996,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"This transaction was executed in multiple trades at prices ranging from $56.00 to $56.99, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (10) of this Form 4."}],"balance_after":2570453,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681982,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":11357,"price":55.1137,"value":625926.2909,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"This transaction was executed in multiple trades at prices ranging from $54.87 to $55.37, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (9) of this Form 4."}],"balance_after":2573586,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681981,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":8535,"price":58.192,"value":496668.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"This transaction was executed in multiple trades at prices ranging from $58.04 to $58.48, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (8) of this Form 4."}],"balance_after":2584943,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681980,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":12480,"price":57.4576,"value":717070.848,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"This transaction was executed in multiple trades at prices ranging from $57.015 to $57.99, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (7) of this Form 4."}],"balance_after":2593478,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681979,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":6485,"price":56.61,"value":367115.85,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $56.01 to $57.00, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (6) of this Form 4."}],"balance_after":2605958,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681978,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":1778,"price":58.8532,"value":104640.9896,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $58.81 to $58.90, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":2612443,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681977,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":13590,"price":58.3824,"value":793416.816,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $57.81 to $58.80, inclusive. The price reported reflects the weighted average sale price. 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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":943861,"source":{"system":"sec-edgar","filing":"0000905148-26-001455","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001455/form4.xml","form_type":"4"}},{"id":826752,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-03-27T22:40:57.000Z","date":"2026-03-26","kind":"sale","planned":false,"acquired":false,"shares":3170,"price":171.3549,"value":543195.033,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $170.86 to $171.85, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":944061,"source":{"system":"sec-edgar","filing":"0000905148-26-001455","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001455/form4.xml","form_type":"4"}},{"id":826751,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-03-27T22:40:57.000Z","date":"2026-03-25","kind":"sale","planned":false,"acquired":false,"shares":1000,"price":177.567,"value":177567.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $177.45 to $177.77, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":947231,"source":{"system":"sec-edgar","filing":"0000905148-26-001455","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001455/form4.xml","form_type":"4"}},{"id":826750,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-03-27T22:40:57.000Z","date":"2026-03-25","kind":"sale","planned":false,"acquired":false,"shares":1000,"price":175.922,"value":175922.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $175.84 to $176.165, inclusive. The price reported reflects the weighted average sale price. 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The remaining 9,212 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. 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Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. 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Each PSA represents a contingent right to receive one share of the Issuer's common stock to the extent the performance-based criteria is met. Reported amount assumes 100% performance-based vesting, but actual number of PSAs earned may be 25% more or less than the reported amount, depending on the extent to which the performance-based vesting criteria are met or not met."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Grant of performance-based restricted stock award (\"PSA\") subject to performance-based and time-based vesting over three years. Performance-based vesting criteria include a combination of return on equity and combined value of the issuer's businesses and its fund, joint venture, and managed portfolios. Each PSA represents a contingent right to receive one share of the Issuer's common stock to the extent the performance-based criteria is met. 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Accordingly, once the exercise price for this option was fixed on November 14, 2025, this option became a \"derivative security,\" as such term is defined in Rule 16a-1(c) under the Securities Exchange Act of 1934, as amended (the \"Exchange Act\"), and reportable under Section 16 of the Exchange Act."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests in four equal installments on November 10, 2026, November 10, 2027, November 10, 2028, and November 10, 2029."}],"balance_after":300000,"derivative":{"exercise_price":126.55,"expiration_date":"2031-11-10","underlying":"Common Stock","underlying_shares":300000},"source":{"system":"sec-edgar","filing":"0000905148-25-004133","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514825004133/form4.xml","form_type":"4"}},{"id":1066901,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2025-08-14T21:23:50.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":200,"price":157.1775,"value":31435.5,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F9","text":"This transaction was executed in multiple trades at prices ranging from $157.175 to $157.18, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (9) of this Form 4."}],"balance_after":957046,"source":{"system":"sec-edgar","filing":"0000905148-25-002979","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514825002979/form4.xml","form_type":"4"}},{"id":1066900,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2025-08-14T21:23:50.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":7067,"price":156.5114,"value":1106066.0638,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"This transaction was executed in multiple trades at prices ranging from $156.14 to $157.115, inclusive. The price reported reflects the weighted average sale price. 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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (17) of this Form 4."}],"balance_after":877795,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":19,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367172,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":454,"price":219.2594,"value":99543.7676,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F16","text":"This transaction was executed in multiple trades at prices ranging from $219.25 to $220.00, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (16) of this Form 4."}],"balance_after":877951,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367171,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":152,"price":215.48,"value":32752.96,"ownership":{"direct":true},"balance_after":878405,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367170,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":1400,"price":213.8186,"value":299346.04,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F15","text":"This transaction was executed in multiple trades at prices ranging from $213.75 to $214.17, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (15) of this Form 4."}],"balance_after":878557,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367169,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":700,"price":212.0764,"value":148453.48,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F14","text":"This transaction was executed in multiple trades at prices ranging from $211.915 to $212.25, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (14) of this Form 4."}],"balance_after":879957,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367168,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":452,"price":210.5,"value":95146.0,"ownership":{"direct":true},"balance_after":880657,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367167,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":26,"price":208.7219,"value":5426.7694,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F13","text":"This transaction was executed in multiple trades at prices ranging from $208.27 to $208.74, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (13) of this Form 4."}],"balance_after":881109,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367166,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":274,"price":207.6833,"value":56905.2242,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F12","text":"This transaction was executed in multiple trades at prices ranging from $207.19 to $208.00, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (12) of this Form 4."}],"balance_after":881135,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367165,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":1001,"price":206.186,"value":206392.186,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F11","text":"This transaction was executed in multiple trades at prices ranging from $206.00 to $206.53, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (11) of this Form 4."}],"balance_after":881409,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}},{"id":1367164,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2024-11-13T21:20:23.000Z","date":"2024-11-08","kind":"sale","planned":false,"acquired":false,"shares":1970,"price":205.2613,"value":404364.761,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"This transaction was executed in multiple trades at prices ranging from $205.00 to $205.86, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (10) of this Form 4."}],"balance_after":882410,"source":{"system":"sec-edgar","filing":"0000905148-24-003053","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514824003053/form4.xml","form_type":"4"}}],"next_cursor":"2024-11-13T21:20:23.000000Z,1367164"}