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Flying Agreements Revenue and Lease, Airport Services and Other Revenues - Flying Agreements (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) aircraft	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) aircraft	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Agreements with other airlines
Percentage of ASMs flown under fixed-fee arrangements			86.90%
Percentage of ASMs flown under pro-rate arrangements			13.10%
Revenues [Abstract]
Operating revenues	$ 350,039	$ 744,383	$ 1,079,975	$ 1,468,077
Rental income under operating leases
Operating lease revenue	9,485	9,016	20,026	18,038
Future minimum rental income
July 2020 through December 2020	11,974		11,974
2021	22,508		22,508
2022	22,196		22,196
2023	21,643		21,643
2024	21,336		21,336
Thereafter	70,938		70,938
Total	$ 170,595		170,595
Percentage of reduction in completed departures of flights	62.00%
Percentage of reduction in completed block hours of flights	66.00%
Deferred revenue	$ 69,100		69,100
Property and equipment and related assets	5,326,696		5,326,696			$ 5,394,681
Balance			15,388		$ 15,388
Additions to credit loss reserve			4,308
Balance	19,696		$ 19,696
Sky West Airlines Inc \| Delta Connection Prorate Agreement
Future minimum rental income
Number of aircraft \| aircraft			21
Sky West Airlines Inc \| United Express Prorate Agreement
Future minimum rental income
Number of aircraft \| aircraft			26
Agreement term			120 days
Third Party Lease
Future minimum rental income
Property and equipment and related assets	$ 132,500		$ 132,500
CRJ 200 \| Sky West Airlines Inc \| Delta Connection Agreement
Future minimum rental income
Number of aircraft \| aircraft			36
Number of aircraft parked and stored \| aircraft			36
Average age of aircraft			18 years
Additional depreciation			$ 30,800
CRJ 200 \| Sky West Airlines Inc \| United Express Agreements
Future minimum rental income
Number of aircraft \| aircraft			70
CRJ 200 \| Sky West Airlines Inc \| American Prorate Agreement
Future minimum rental income
Number of aircrafts terminated \| aircraft	7
CRJ 200 \| Sky West Airlines Inc \| Forecast \| Delta Connection Agreement
Future minimum rental income
Additional depreciation					$ 22,300
CRJ 700 \| American Capacity Purchase Agreement
Future minimum rental income
Number of aircraft \| aircraft			61
Number of aircraft to be placed in service \| aircraft			9
Total number of aircraft operated \| aircraft			70
CRJ 700 \| Sky West Airlines Inc \| Delta Connection Agreement
Future minimum rental income
Number of aircraft \| aircraft			6
CRJ 700 \| Sky West Airlines Inc \| United Express Agreements
Future minimum rental income
Number of aircraft \| aircraft			19
CRJ 900 \| Sky West Airlines Inc \| Delta Connection Agreement
Future minimum rental income
Number of aircraft \| aircraft			43
CRJ 900 \| Sky West Airlines Inc \| Delta Connection Prorate Agreement
Future minimum rental income
Number of aircraft to be placed in service \| aircraft			1
Agreement term			9 years
E175 \| Sky West Airlines Inc \| Delta Connection Agreement
Future minimum rental income
Number of aircraft \| aircraft			67
E175 \| Sky West Airlines Inc \| Delta Connection Prorate Agreement
Future minimum rental income
Number of aircraft to be placed in service \| aircraft			4
E175 \| Sky West Airlines Inc \| United Express Agreements
Future minimum rental income
Number of aircraft \| aircraft			90
E175 \| Sky West Airlines Inc \| American Prorate Agreement
Future minimum rental income
Number of aircraft to be placed in service \| aircraft			20
Current assets
Future minimum rental income
Gross receivables current	$ 47,600		$ 47,600
Other noncurrent assets
Future minimum rental income
Gross receivables Non-current	73,400		73,400
Flying agreements
Revenues [Abstract]
Operating revenues	336,370	725,335	1,045,864	1,425,336
Rental income under operating leases
Total operating revenues	336,370	725,335	1,045,864	1,425,336
Flight operations
Rental income under operating leases
Total operating revenues	132,061	383,732	498,469	770,278
Aircraft lease and fixed revenue
Rental income under operating leases
Total operating revenues	168,103	206,678	410,838	414,059
Prorate agreements
Rental income under operating leases
Total operating revenues	36,206	134,925	136,557	240,999
Lease, airport services and other
Rental income under operating leases
Total operating revenues	13,669	19,048	34,112	42,741
Airport customer service and other
Rental income under operating leases
Total operating revenues	$ 4,184	$ 10,032	$ 14,086	$ 24,703