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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Retirement Benefits [Abstract]    
Percentage of employees pay 100.00%  
Years of service 5.00%  
Percentage of compensation in cash 3 years  
Percentage of employees' pay for profit sharing match 5.00%  
Period of discretionary contribution 3 years  
Percentage of FAA licensed employees gross pay for which ER can contribute discretionary profit sharing contribution to plan 3.00%  
Percentage of company contribution to pilots retirement program 16.00%  
Pilots retirement vesting period 3 years  
Percent 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%  
Contribution to employee retirement plan $ 125 $ 100