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Leases, Commitments, Guarantees and Contingencies - Operating Leases (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) aircraft | Dec. 31, 2024
Lessee, Lease, Description [Line Items] |  |
Lease term |  | 5 years
Purchase obligation | $ | $ 2,434,032 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Purchase obligation | $ | 50,000 |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Purchase obligation | $ | $ 60,000 |
E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircraft under purchase agreement | 74 |
Number of additional aircrafts with secured delivery positions | 44 |
CRJ 900 |  |
Lessee, Lease, Description [Line Items] |  |
Number of used aircraft acquired | 21 |
United | E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircrafts to be purchased and placed into service | 13 |
Alaska | E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircrafts to be purchased and placed into service | 1 |
Delta | E175 |  |
Lessee, Lease, Description [Line Items] |  |
Number of aircrafts to be purchased and placed into service | 16 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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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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