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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS
The Company’s money market funds and interest rate swaps are reported on the Company’s consolidated balance sheets at fair values based on market values from comparable transactions. The fair value of the Company’s money market funds, convertible note, convertible note hedges and interest rate swaps are based on observable inputs (Level 2) from comparable market transactions.
The fair value of the stock warrant obligations resulting from aircraft leased to Amazon were determined using a Black-Scholes pricing model which considers various assumptions, including the Company’s common stock price, the volatility of the Company’s common stock, the expected dividend yield, exercise price and the risk-free interest rate (Level 2 inputs). The fair value of the stock warrant obligations for unvested stock warrants, conditionally granted to Amazon for the execution of incremental, future aircraft leases, include additional assumptions including the expected exercise prices and the probabilities that future leases will occur (Level 3 inputs).
The following table reflects assets and liabilities that are measured at fair value on a recurring basis (in thousands):
As of March 31, 2021Fair Value Measurement UsingTotal
 Level 1Level 2Level 3
Assets
Cash equivalents—money market$— $40 $— $40 
Total Assets$— $40 $— $40 
Liabilities
Interest rate swap$— $(10,880)$— $(10,880)
Stock warrant obligations— — (96,536)(96,536)
Total Liabilities$— $(10,880)$(96,536)$(107,416)
As of December 31, 2020Fair Value Measurement UsingTotal
 Level 1Level 2Level 3
Assets
Cash equivalents—money market$— $20,389 $— $20,389 
Total Assets$— $20,389 $— $20,389 
Liabilities
Interest rate swap$— $(13,414)$— $(13,414)
Stock warrant obligation— (9,058)(94,416)(103,474)
Total Liabilities$— $(22,472)$(94,416)$(116,888)
As a result of lower market interest rates compared to the stated interest rates of the Company’s fixed rate debt obligations, the fair value of the Company’s debt obligations, based on Level 2 observable inputs, was approximately $48.2 million more than the carrying value, which was $1,497.8 million at March 31, 2021. As of December 31, 2020, the fair value of the Company’s debt obligations was approximately $70.8 million less than the carrying value, which was $1,479.1 million. The non-financial assets, including goodwill, intangible assets and property and equipment are measured at fair value on a non-recurring basis.