Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions	Dec. 31, 2020 gal	[1]
2021
Volume of Fuel Hedging
Fuel Hedged (in gallons)	1,283
2022
Volume of Fuel Hedging
Fuel Hedged (in gallons)	1,220
2023
Volume of Fuel Hedging
Fuel Hedged (in gallons)	643
Beyond 2023
Volume of Fuel Hedging
Fuel Hedged (in gallons)	101

[1] Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices and the Company's flight schedule fluctuate.