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Leases, Commitments, Guarantees and Contingencies - Operating Leases (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 USD ($) aircraft | Dec. 31, 2024
Lessee, Lease, Description [Line Items] |  |
Lease term |  | 5 years
Purchase obligation | $ | $ 2,240,083 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Purchase obligation | $ | 20,000 |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Purchase obligation | $ | $ 25,000 |
E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft under purchase agreement | 68 |
Number of additional aircraft with secured delivery positions | 44 |
United | E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft to be purchased and placed into service | 8 |
Delta | E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft to be purchased and placed into service | 16 |

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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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- Definition Lease term for sale and leaseback transaction, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479741/842-40-50-2 + Details
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