Annual report pursuant to Section 13 and 15(d)

BUSINESS COMBINATIONS - Intangible assets (Details)

v3.20.4
BUSINESS COMBINATIONS - Intangible assets (Details)
Jun. 10, 2019
USD ($)
FAA part 145 certificate (indefinite lived) | Qwest Air Parts, Inc  
Acquired Indefinite-lived Intangible Assets [Line Items]  
Fair value of indefinite intangible assets acquired $ 724,000