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Crewmember Retirement Plan (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Percentage of compensation in cash |  |  | 100.00% |  |
Percentage of employees' pay |  |  | 5.00% |  |
Years of service |  |  | 3 years |  |
Percentage of company contribution to pilots retirement program | 16.00% |  |  |  |
Pilots retirement vesting period |  |  | 3 years |  |
Percentage of eligible pre-tax profits the company contributes to profit sharing until the pre-tax margin is 18% |  |  | 10.00% |  |
Profit sharing calculation trigger, pretax margin |  |  | 18.00% |  |
Percentage of eligible pre-tax profits the company contributes to profit sharing when pre-tax margin is above 18% |  |  | 20.00% |  |
Defined contribution plan, cost |  |  | $ 271 | $ 249 | $ 213
Retirement Plus |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Percentage of employees' pay |  |  | 5.00% |  |
Years of service |  |  | 3 years |  |
Retirement Advantage |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Percentage of employees' pay |  |  | 3.00% |  |
Subsequent Event | Retirement Non-elective Crewmember |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Percentage of employees' pay |  | 5.00% |  |  |
Years of service |  | 3 years |  |  |
Percentage of increase in pay |  | 5.00% |  |  |
Subsequent Event | Retirement Non-elective Licensed |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Percentage of employees' pay |  | 8.00% |  |  |
Years of service |  | 3 years |  |  |

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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent Increase In Compensation + References No definition available. + Details
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- Definition Defined contribution plan requisite service period for vesting. + References No definition available. + Details
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- Definition Percentage of Company contribution to Pilots Retirement Program based on eligible pilot compensation + References No definition available. + Details
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- Definition Percentage Of Eligible Pre-tax Profits the Company Contributes To Profit Sharing until the Pre-tax Margin is 18% + References No definition available. + Details
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- Definition Percentage Of Eligible Pre-tax Profits the Company Contributes to Profit Sharing when Pre-tax Margin is above 18% + References No definition available. + Details
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- Definition Vesting period for company matching contributions relating to pilots retirement program + References No definition available. + Details
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- Definition Profit Sharing Calculation Trigger, Pretax Margin + References No definition available. + Details
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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 No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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