Note 7  Leases, Commitments and Contingencies  Effective January 1, 2019, the Company adopted Topic 842. The Company leases property and equipment under operating leases. For leases with durations longer than 12 months, the Company recorded the related operating lease right-of-use asset and operating lease liability at the present value of lease payments over the term. The Company used its incremental borrowing rate to discount the lease payments based on information available at lease commencement.  Aircraft  As of September 30, 2020, the Company had 107 aircraft under operating leases with remaining terms ranging from less than one year to ten years.  With the adoption of Topic 842 on January 1, 2019, the Company evaluated whether leased aircraft asset groups within the Companys fleet were impaired. Under the transition guidance for Topic 842, a company is permitted to recognize a previously unrecognized impairment related to a right-of-use asset in the period prior to the adoption date of Topic 842 if the event giving rise to the impairment occurred before the adoption date. In 2016, the Company recorded an impairment on certain of its long-lived assets, which included the Companys CRJ200 aircraft . In 2016, the market lease rate was less than the contractual lease rate on the Companys CRJ200 leased aircraft. The Company recorded an impairment of $13.1 million (net of tax) as an adjustment to the Companys January 1, 2019 retained earnings related to the previously unrecognized impairment of these leased CRJ200s. The Company had no impairment charges related to its leased CRJ200s during the nine months ended September 30, 2020.  Airport facilities  The Company has operating leases for facility space including airport terminals, office space, cargo warehouses and maintenance facilities. The Company generally leases this space from government agencies that control the use of the various airports. The remaining lease terms for facility space vary from one month to 36 years. The Companys operating leases with lease rates that are variable based on airport operating costs, use of the facilities or other variable factors are excluded from the Companys right-of-use assets and operating lease liabilities in accordance with accounting guidance.  Leases  As of September 30, 2020, the Companys right-of-use assets were $296.4 million, the Companys current maturities of operating lease liabilities were $83.3 million, and the Companys noncurrent lease liabilities were $221.8 million. During the nine months ended September 30, 2020, the Company paid $68.0 million in operating leases reflected as a reduction from operating cash flows.  The table below presents lease related terms and discount rates as of September 30, 2020.              As of September 30, 2020 Weighted-average remaining lease term for operating leases 6.6 years Weighted-average discount rate for operating leases   6.1%    The Companys lease costs for the three and nine months ended September 30, 2020 and 2019 included the following components (in thousands):                 For the three months ended September 30,  For the nine months ended September 30,  2020 2019  2020 2019 Operating lease cost $ 23,538 $ 25,173  $ 72,696 $ 80,041 Variable and short-term lease cost  950  1,343  3,501  4,164 Sublease income   (1,587)   (357)   (4,718)   (357) Total lease cost $ 22,901 $ 26,159  $ 71,479 $ 83,848          As of September 30, 2020, the Company leased aircraft, airport facilities, office space, and other property and equipment under non-cancelable operating leases, which are generally on a long-term, triple-net lease basis pursuant to which the Company pays taxes, maintenance, insurance and certain other operating expenses applicable to the leased property. The Company expects that, in the normal course of business, such operating leases that expire will be renewed or replaced by other leases, or the property may be purchased rather than leased. The following table summarizes future minimum rental payments primarily related to leased aircraft required under operating leases that had initial or remaining non-cancelable lease terms as of September 30, 2020 (in thousands):       October 2020 through December 2020 $ 22,393 2021  85,599  2022  76,923  2023  69,419  2024  28,091  Thereafter  98,448    $ 380,873   The Company is coordinating with its major airline partners on the timing of upcoming fleet deliveries under previously announced deals in response to COVID-19-related schedule reductions. The anticipated future delivery dates are subject to change. As of September 30, 2020, the Company had a firm purchase commitment for 24 E175 aircraft from Embraer, S.A. (Embraer) with anticipated delivery dates through 2022.  Subsequent to September 30, 2020, the Company also secured agreements to acquire 21 used CRJ700 aircraft and lease the aircraft under a multi-year term to another regional airline operating for United Airlines. The aircraft purchases are expected to be financed with debt during the three months ended December 31, 2020.  The following table summarizes the Companys commitments and obligations as noted for each of the next five years and thereafter (in thousands):                          Total Oct - Dec 2020 2021 2022 2023 2024 Thereafter Operating lease payments for aircraft and facility obligations  $ 380,873  $ 22,393  $ 85,599  $ 76,923  $ 69,419  $ 28,091  $ 98,448 Firm aircraft and spare engine commitments  655,906   114,223   139,003   402,680           Interest commitments (1)  541,062   28,777   114,652   99,811   82,790   67,376   147,656  Principal maturities on long-term debt  3,101,657   69,405   387,309   388,152   397,913   351,431   1,507,447  Total commitments and obligations  $ 4,679,498  $ 234,798  $ 726,563  $ 967,566  $ 550,122  $ 446,898  $ 1,753,551   (1) At September 30, 2020, the Company had variable rate notes representing only 2.4% of its total long-term debt .