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Maintenance rights and lease premium, net
 6 Months Ended
Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Maintenance rights and lease premium, net Maintenance rights and lease premium, net
Maintenance rights and lease premium, net consisted of the following as of June 30, 2025 and December 31, 2024:
June 30, 2025December 31, 2024
Maintenance rights$1,505,434 $1,669,742 
Lease premium, net396,508 460,251 
$1,901,942 $2,129,993 
Movements in maintenance rights during the six months ended June 30, 2025 and 2024 were as follows:
Six Months Ended June 30,
20252024
Maintenance rights at beginning of period
$1,669,742 $2,099,513 
EOL and MR contract maintenance rights expense
(36,035)(51,841)
MR contract maintenance rights write-off due to maintenance liability release
(11,066)(34,988)
EOL contract maintenance rights write-off due to cash receipt
(25,372)(97,289)
EOL and MR contract maintenance rights write-off due to sale of aircraft(91,835)(45,016)
Maintenance rights at end of period
$1,505,434 $1,870,379 
The following tables present details of lease premium assets and related accumulated amortization as of June 30, 2025 and December 31, 2024:
June 30, 2025
Gross carrying amountAccumulated
amortization		Net carrying amount
Lease premium$801,716 $(405,208)$396,508 
December 31, 2024
Gross carrying amountAccumulated
amortization		Net carrying amount
Lease premium$907,995 $(447,744)$460,251 
Lease premium assets that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above.
During the three months ended June 30, 2025 and 2024, we recorded amortization expense for lease premium assets of $28 million and $41 million, respectively. During the six months ended June 30, 2025 and 2024, we recorded amortization expense for lease premium assets of $60 million and $83 million, respectively.
Other intangibles, net
Other intangibles, net consisted of the following as of June 30, 2025 and December 31, 2024:
June 30, 2025December 31, 2024
Customer relationships, net$124,294 $134,883 
Other intangible assets4,433 4,783 
$128,727 $139,666 
The following tables present details of customer relationships and related accumulated amortization as of June 30, 2025 and December 31, 2024:
June 30, 2025
Gross carrying amountAccumulated
amortization		Net carrying amount
Customer relationships$360,000 $(235,706)$124,294 
December 31, 2024
Gross carrying amountAccumulated
amortization		Net carrying amount
Customer relationships$360,000 $(225,117)$134,883 
During the three months ended June 30, 2025 and 2024, we recorded amortization expense for customer relationships of $5 million. During the six months ended June 30, 2025 and 2024, we recorded amortization expense for customer relationships of $11 million.