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Significant Customers (Tables)
 6 Months Ended
Jun. 30, 2021
Concentration Risk [Line Items]  
Schedule of Stockholders' Equity Note, Warrants or Rights
Issued and outstanding warrants are summarized below as of June 30, 2021:
Common Shares in millions
Lease CommitmentExercise priceVestedNon-VestedExpiration
2018 Investment Agreement10 aircraft$21.5314.80.0December 20, 2025
2018 Investment Agreement12 aircraft$20.404.72.3December 20, 2025
Accounts Receivable [Member]  
Concentration Risk [Line Items]  
Schedule of Revenue by Major Customers by Reporting Segments
The accounts receivable from the Company's three largest customers as of June 30, 2021 and December 31, 2020 are as follows (in thousands):
June 30,December 31,
20212020
CustomerAccounts Receivable
DoD$40,060 $32,625 
Amazon68,548 55,997 
DHL11,456 10,471 
Revenue, Product and Service Benchmark [Member]  
Concentration Risk [Line Items]  
Schedule of Revenue by Major Customers by Reporting Segments The percentage of the Company's revenues for the Company's three largest customers, for the three and six month periods ending June 30, 2021 and 2020 are as follows:
Three Months EndedSix Months Ended
June 30, June 30,
2021202020212020
CustomerPercentage of RevenuePercentage of Revenue
DoD25%33%24%32%
Amazon37%29%36%29%
DHL13%12%13%11%