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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2023 USD ($) employee aircraft	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Concentration Risk and Significant Customers
Accrued workers' compensation liability \| $	$ 20.6	$ 21.6
Accrued workers' compensation liability, current \| $	$ 7.3	$ 8.0
E175
Concentration Risk and Significant Customers
Commitment to purchase number of aircraft, 2024	5
Commitment to purchase number of aircraft, 2025	8
Commitment to purchase number of aircraft, 2026	8
Revenue from rights, concentration risk \| Customer Concentration Risk \| Delta, United, and Continental Combined
Concentration Risk and Significant Customers
Concentration risk (as a percent)	70.90%	72.50%	73.50%
Full-time equivalent number of employees \| Labor Force Concentration Risk
Concentration Risk and Significant Customers
Number of employees \| employee	13,000
SkyWest Airlines \| Full-time equivalent number of employees \| Unionized employees
Concentration Risk and Significant Customers
Approximate number of active employees \| employee	0