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Leases (Notes)
 3 Months Ended
Mar. 31, 2022
Leases [Abstract]  
Lessee, Operating Leases Leases
The Company evaluates all operating leases and they are measured on the balance sheet with a lease liability and right-of-use asset (“ROU”) at inception. ROU assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make scheduled lease payments. Airport terminal leases mostly include variable lease payments outside of those based on a fixed index, and are therefore not recorded as ROU assets.

The following table summarizes the Company's total assets and liabilities related to leases as of the dates indicated:
(in thousands)Classification on the Balance SheetMarch 31, 2022December 31, 2021
Assets
Operating lease assets(1)
Operating lease right-of-use assets$125,616 $130,087 
Finance lease assets(2)
Property and equipment, net407,745 338,469 
Total lease assets$533,361 $468,556 
Liabilities
Current
Operating(1)
Current operating lease liabilities$19,314 $19,081 
Finance(2)
Current maturities of long-term debt and finance lease obligations34,405 16,960 
Noncurrent
Operating(1)
Noncurrent operating lease liabilities110,210 115,067 
Finance(2)
Long-term debt and finance lease obligations349,011 301,532 
Total lease liabilities$512,940 $452,640 
(1) The March 31, 2022 number represents assets and liabilities of 17 aircraft, office equipment, certain airport and terminal facilities, and other assets under operating leases
(2) The March 31, 2022 number represents assets and liabilities of 18 aircraft under finance leases