Significant Customers (Tables)

3 Months Ended

Mar. 31, 2021

Concentration Risk [Line Items]

Schedule of Stockholders' Equity Note, Warrants or Rights

Issued and outstanding warrants are summarized below as of May 10, 2021:

			Common Shares in millions
	Lease Commitment	Exercise price	Vested	Non-Vested	Expiration
2018 Investment Agreement	10 aircraft	$21.53	14.8	0.0	December 20, 2025
2018 Investment Agreement	12 aircraft	$20.40	2.9	4.1	December 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 March 31, 2021 and December 31, 2020 are as follows (in thousands):

	March 31,		December 31,
	2021		2020
Customer	Accounts Receivable
DoD	$	31,204	$	32,625
Amazon	58,132		55,997
DHL	11,601		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 month periods ending March 31, 2021 and 2020 are as follows:

	Three Months Ended
	March 31,
	2021	2020
Customer	Percentage of Revenue
DoD	22%	30%
Amazon	35%	29%
DHL	14%	11%