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Commitments and Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2021 USD ($) airport	Mar. 31, 2022 USD ($) aircraft	Feb. 28, 2022 aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of fiscal year		$ 700
2023		1,600
2024		2,000
2025		1,700
2026		1,400
Thereafter		1,000
Restricted assets pledged under letter of credit		32
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements		$ 26
Employment agreement term		5 years
Number of northeast airports | airport	4
One-time bonus payment	$ 30
Base pay increase	3.00%
Automatic renewal term, employment agreement, term		5 years
Renewal notice period, employment agreement, period		90 days
A220-300
Unrecorded Unconditional Purchase Obligation [Line Items]
Option exercise, number of aircraft | aircraft			30
Option exercise, number of aircraft, remaining available | aircraft			20
Unrecorded unconditional purchase obligations disclosure | aircraft		92
Aircraft expected for delivery | aircraft		9
A-321 Neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligations disclosure | aircraft		64

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Collective Bargaining Agreement, Mediation, Base Pay Increase, Percentage

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Number Of Aircraft Expected To Receive In Fiscal Year

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Number Of Northeast Airports

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Number Of Options Converted Into Firm Orders, Available Remaining

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Restricted assets pledged under standby letters of credit related to workers compensation insurance policies and other agreements requiring issuance of letters of credit.

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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