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Debt Obligations (Tables)
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Notes Payable
Debt obligations consisted of the following:
September 30,
2025		December 31,
2024
(in thousands)
Credit facility at a floating rate of interest of one-month term Secured Overnight Financing Rate (“SOFR”) plus 2.35% at September 30, 2025, secured by engines, airframes, and loan assets. The credit facility has a committed amount of $1.0 billion at September 30, 2025, which revolves until the maturity date of October 2029.
$497,000 $693,000 
WEST VIII Series A 2025 term notes payable at a fixed rate of interest of 5.58%, maturing in June 2050, secured by engines, airframes, and loan assets
519,492 — 
WEST VIII Series B 2025 term note payable at a fixed rate of interest of 6.07%, maturing in June 2050, secured by engines, airframes, and loan assets
71,381 — 
WEST VII Series A 2023 term notes payable at a fixed rate of interest of 8.00%, maturing in October 2048, secured by engines, airframes, and loan assets
237,500 356,355 
WEST VI Series A 2021 term notes payable at a fixed rate of interest of 3.10%, maturing in May 2046, secured by engines, airframes, and loan assets
229,343 241,065 
WEST VI Series B 2021 term notes payable at a fixed rate of interest of 5.44%, maturing in May 2046, secured by engines, airframes, and loan assets
31,839 33,486 
WEST VI Series C 2021 term notes payable at a fixed rate of interest of 7.39%, maturing in May 2046, secured by engines, airframes, and loan assets
8,039 9,926 
WEST V Series A 2020 term notes payable at a fixed rate of interest of 3.23%, maturing in March 2045, secured by engines
216,870 226,572 
WEST V Series B 2020 term notes payable at a fixed rate of interest of 4.21%, maturing in March 2045, secured by engines
30,211 31,563 
WEST V Series C 2020 term notes payable at a fixed rate of interest of 6.66%, maturing in March 2045, secured by engines
6,255 8,142 
WEST IV Series A 2018 term notes payable at a fixed rate of interest of 4.75%, maturing in September 2043, secured by engines
35,494 199,846 
WEST IV Series B 2018 term notes payable at a fixed rate of interest of 5.44%, maturing in September 2043, secured by engines
9,868 27,338 
WEST III Series A 2017 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042, secured by engines
146,047 161,308 
WEST III Series B 2017 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042, secured by engines
19,609 21,659 
Willis Warehouse Facility LLC (“WWFL”) credit facility at a floating rate of interest of one-month term SOFR, plus 1.88% at September 30, 2025 maturing in May 2030, secured by engines, airframes, and loan assets. The WWFL credit facility has a committed amount of $500.0 million at September 30, 2025.
84,788 221,882 
Note payable at a fixed rate of interest of 5.00%, maturing in February 2033, secured by an engine
20,573 20,780 
Note payable at a fixed rate of interest of 4.59%, maturing in November 2032, secured by an engine
21,692 22,094 
Note payable at a fixed rate of interest of 4.23%, maturing in June 2032, secured by an engine
17,637 17,710 
Note payable at a fixed rate of interest of 5.17%, maturing in March 2033, secured by an engine
23,718 — 
Note payable at a fixed rate of interest of 5.91%, maturing in March 2034, secured by an engine
20,902 — 
Note payable at a fixed rate of interest of 5.83%, maturing in April 2034, secured by an engine
19,693 — 
2,267,951 2,292,726 
Less: unamortized debt issuance costs and note discounts(28,500)(28,174)
Total debt obligations$2,239,451 $2,264,552 
Schedule or Debt Maturities
Principal outstanding at September 30, 2025 is expected to be repayable as follows:

Year(in thousands)
2025$67,941 
202670,451 
2027201,449 
2028252,499 
2029956,344 
Thereafter719,267 
Total$2,267,951