Cover - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2025	Apr. 30, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2025
Entity Central Index Key	0001487712
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Amendment Flag	true
Document Transition Report	false
Entity File Number	001-35121
Entity Registrant Name	SUMISHO AIR LEASE CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-1840403
Entity Address, Address Line One	2000 Avenue of the Stars
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90067
City Area Code	310
Local Phone Number	553-0555
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 6.1
Entity Common Stock, Shares Outstanding		200
Entity Address, Address Line Two	Suite 1000N
Amendment Description	EXPLANATORY NOTE On April 8, 2026, pursuant to the previously announced Agreement and Plan of Merger, dated as of September 1, 2025 (the “Merger Agreement”), by and among Sumisho Air Lease Corporation (formerly known as Air Lease Corporation) (the “Company,” “we,” “our,” or “us”), Sumisho Air Lease Corporation Designated Activity Company, an Irish private limited company (“Parent”), and Takeoff Merger Sub Inc., a Delaware corporation (“Merger Sub”), Merger Sub merged with and into the Company (the “Merger”), with the Company surviving the Merger as an indirect subsidiary of Parent. The Merger became effective on April 8, 2026 (the “Effective Time”) pursuant to the Certificate of Merger that was filed with the Delaware Secretary of State on such date. At the Effective Time, each share of the Class A common stock of the Company, par value $0.01 per share (the “Class A Common Stock”), issued and outstanding immediately prior to the Effective Time, other than shares that were canceled or converted into shares of the surviving corporation pursuant to the Merger Agreement, was converted into the right to receive $65.00 per share of the Class A Common Stock, in cash, without interest and less any required withholding taxes. On February 12, 2026, the Company filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “2025 Form 10-K”) with the U.S. Securities and Exchange Commission (the “SEC”). The Company does not intend to hold a public annual meeting of stockholders in 2026 as a result of the Merger. The Company is filing this Amendment No. 1 on Form 10-K/A (the “Amendment”) pursuant to General Instruction G(3) of Form 10-K to include in Part III the information that was not included in the 2025 Form 10-K because it does not intend to file a proxy statement for its 2026 annual meeting of stockholders within 120 days of the end of our fiscal year ended December 31, 2025. This Amendment amends and restates in its entirety the cover page, and Items 10 through 14 of Part III of the 2025 Form 10-K, to include information previously omitted from the 2025 Form 10-K in reliance on General Instruction G(3) to Form 10-K. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment. Except as described above, this Amendment does not amend, modify or update the other disclosures in the 2025 Form 10-K. The 2025 Form 10-K continues to reflect information as of the date of the 2025 Form 10-K, and we have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the 2025 Form 10-K, including the completion of the Merger. This Amendment should be read in conjunction with the 2025 Form 10-K and with our other filings with the SEC.