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Leases, Commitments, Guarantees and Contingencies - Operating Leases (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) aircraft	Dec. 31, 2024
Lessee, Lease, Description [Line Items]
Lease term		5 years
Purchase obligation | $	$ 2,417,029
Minimum
Lessee, Lease, Description [Line Items]
Purchase obligation | $	40,000
Maximum
Lessee, Lease, Description [Line Items]
Purchase obligation | $	$ 50,000
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	12
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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Number of additional aircrafts with secured delivery positions.

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Represents the number of aircraft to be purchased under the agreement.

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Number of aircrafts to be purchased and placed into service.

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The number of used aircraft acquired.

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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

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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

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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

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