Cover Page - shares	3 Months Ended
	Mar. 31, 2026	May 05, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
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, Address Line Two	Suite 1000N
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		200
Entity Central Index Key	0001487712
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1