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Concentrations
3 Months Ended
Dec. 31, 2020
Risks And Uncertainties [Abstract]  
Concentrations

4.

Concentrations

At December 31, 2020, the Company had capacity purchase agreements with American and United and a Flight Services Agreement with DHL Network Operations (USA). All of the Company's condensed consolidated revenue for the three months ended December 31, 2020 and 2019 and accounts receivable at December 31, 2020 and September 30, 2019 was derived from these agreements.

Amounts billed by the Company under capacity purchase agreements are subject to the Company's interpretation of the applicable capacity purchase agreement and are subject to audit by the Company's major airline partners. Periodically, the Company's major airline partners dispute amounts billed and pay amounts less than the amount billed. Ultimate collection of the remaining amounts not only depends upon the Company prevailing under the applicable audit, but also upon the financial well-being of the major airline partner. As such, the Company periodically reviews amounts due based on historical collection trends, the financial condition of airline partners and external market factors and records a reserve for amounts estimated to be uncollectible. The allowance for doubtful accounts was $0.9 million and $0.8 million at December 31, 2020 and September 30, 2020, respectively. If the Company's ability to collect these receivables and the financial viability of its partners is materially different than estimated, the Company's estimate of the allowance could be materially impacted.

American accounted for approximately 46% and 51% of the Company's total revenue for the three months ended December 31, 2020 and 2019, respectively. United accounted for approximately 53% and 49% of the Company's revenue for the three months ended December 31, 2020 and 2019, respectively. DHL accounted for 1% and 0% of the Company’s revenue for the three months ended December 31, 2020 and 2019, respectively. A termination of either the American or the United capacity purchase agreement would have a material adverse effect on the Company's business prospects, financial condition, results of operations, and cash flows.