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Nature of Operations and Summary of Significant Accounting Policies - Flying Agreements (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2020
USD ($)
Jun. 30, 2023
aircraft
Dec. 31, 2021
USD ($)
aircraft
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2023
aircraft
Agreements with other airlines            
Percentage of ASMs flown under fixed-fee arrangements     84.30% 87.00%    
Percentage of ASMs flown under pro-rate arrangements     15.70% 13.00%    
Rental income under operating leases            
Operating lease revenue relating to lease payments     $ 46,532 $ 34,791 $ 27,552  
Operating lease revenue relating to variable lease payments     19,998 5,710 9,608  
Total operating revenues     2,713,491 2,127,106 2,971,963  
Future minimum rental income            
2022     45,777      
2023     45,008      
2024     42,593      
2025     39,145      
2026     34,516      
Thereafter     120,636      
Total     327,675      
Deferred revenue recognized     6,800      
Unbilled revenue     8,404      
Deferred revenue     103,900 110,700    
Deferred revenue in other current liabilities     24,500      
Deferred revenue in other long-term liabilities     79,400      
Property and equipment and related assets     5,498,599 5,362,048    
Deferred recognizing revenue     (6,832) 110,728    
Accounts receivable     65,300 34,500    
Gross receivables current     86,200      
Gross receivables Non-current     230,700      
Balance $ 15,388   46,225 15,388    
Adjustments to credit loss reserves     (4,249) 30,837    
Balance     $ 41,976 46,225 15,388  
Topic 326            
Future minimum rental income            
Credit loss $ 11,600          
United | United Express Agreements [Member]            
Future minimum rental income            
Agreement term     4 years 2 months 12 days      
United | United Express Prorate Agreement [Member]            
Future minimum rental income            
Notice period for termination of agreement     120 days      
Delta            
Future minimum rental income            
Number of aircraft | aircraft     149      
Delta | Delta Connection Prorate Agreement            
Future minimum rental income            
Notice period for termination of agreement     30 days      
Delta | Delta Connection Agreements [Member]            
Future minimum rental income            
Agreement term     5 years 6 months      
American            
Future minimum rental income            
Number of aircraft | aircraft     108      
American | American Capacity Purchase Agreement [Member]            
Future minimum rental income            
Agreement term     4 years 9 months 18 days      
Alaska | Alaska Capacity Purchase Agreement [Member]            
Future minimum rental income            
Agreement term     8 years 7 months 6 days      
Jet aircraft and spare engines leased to third parties            
Future minimum rental income            
Property and equipment and related assets     $ 252,600      
CRJ 200 [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     50      
CRJ 200 [Member] | United | United Express Agreements [Member]            
Future minimum rental income            
Number of aircraft | aircraft     70      
CRJ 200 [Member] | Delta | Delta Connection Prorate Agreement            
Future minimum rental income            
Number of aircraft | aircraft     29      
CRJ 700 [Member] | Minimum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     65      
CRJ 700 [Member] | Maximum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     76      
CRJ 700 [Member] | United | United Express Agreements [Member]            
Future minimum rental income            
Number of aircraft | aircraft     19      
CRJ 700 [Member] | Delta | Delta Capacity Purchase Agreement            
Future minimum rental income            
Number of aircraft | aircraft     5      
CRJ 700 [Member] | American            
Future minimum rental income            
Number of aircraft under purchase agreement | aircraft     11      
CRJ 700 [Member] | American | American Capacity Purchase Agreement [Member]            
Future minimum rental income            
Number of aircraft | aircraft     90      
CRJ 900 | Minimum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     65      
CRJ 900 | Maximum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     76      
CRJ 900 | Sky West Airlines Inc [Member] | Forecast            
Future minimum rental income            
Number of aircraft to be placed by 2022 | aircraft   16        
Number of aircraft replaced | aircraft           16
Number of aircraft to be replaced | aircraft   16        
CRJ 900 | Delta | Delta Capacity Purchase Agreement            
Future minimum rental income            
Number of aircraft | aircraft     44      
E175 [Member] | Minimum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     65      
E175 [Member] | Maximum [Member]            
Future minimum rental income            
Number of seats on aircraft | aircraft     76      
E175 [Member] | Sky West Airlines Inc [Member] | Delta Capacity Purchase Agreement            
Future minimum rental income            
Number of aircraft under purchase agreement | aircraft     16      
Number of aircraft to be placed by 2022 | aircraft     16      
Number aircraft right to repurchase | aircraft     16      
E175 [Member] | Sky West Airlines Inc [Member] | Alaska Capacity Purchase Agreement [Member]            
Future minimum rental income            
Number of aircraft under purchase agreement | aircraft     11      
E175 [Member] | United | United Express Agreements [Member]            
Future minimum rental income            
Number of aircraft | aircraft     90      
E175 [Member] | Delta | Delta Capacity Purchase Agreement            
Future minimum rental income            
Number of aircraft | aircraft     71      
E175 [Member] | American            
Future minimum rental income            
Number of aircraft | aircraft     2      
E175 [Member] | American | American Capacity Purchase Agreement [Member]            
Future minimum rental income            
Number of aircraft | aircraft     18      
Flying agreements            
Rental income under operating leases            
Total operating revenues     $ 2,615,076 2,060,801 2,889,265  
Future minimum rental income            
Accounts receivable     50,800 27,500    
Flight operations            
Rental income under operating leases            
Total operating revenues     1,146,375 945,008 1,538,062  
Aircraft lease and fixed revenue            
Rental income under operating leases            
Total operating revenues     1,059,017 846,933 830,247  
Prorate agreements            
Rental income under operating leases            
Total operating revenues     409,684 268,860 520,956  
Airport customer service and other revenue            
Rental income under operating leases            
Total operating revenues     31,885 25,804 45,538  
Lease, airport services and other.            
Rental income under operating leases            
Total operating revenues     $ 98,415 $ 66,305 $ 82,698