SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands, shares in Millions		12 Months Ended
	Jun. 10, 2019 USD ($) shares	Mar. 31, 2024 USD ($) segment shares	Mar. 31, 2023 USD ($)	Apr. 24, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle
Number of reportable segments | segment		4
Goodwill		$ 10,540	$ 10,563
Passthrough cost		36,400	29,200
Fair Value, Inputs, Level 3
New Accounting Pronouncements or Change in Accounting Principle
Contrail's redeemable non-controlling interest (Level 3)		7,437	$ 7,972
Air T Funding | Warrant
New Accounting Pronouncements or Change in Accounting Principle
Stock issued during period (in shares) | shares	8.4
Stock issued during period	$ 21,000
Contrail R N C I | Fair Value, Inputs, Level 3
New Accounting Pronouncements or Change in Accounting Principle
Contrail's redeemable non-controlling interest (Level 3)		$ 7,400
Trust Preferred Capital Security
New Accounting Pronouncements or Change in Accounting Principle
Warrant exercised (in shares) | shares		5.3
Warrants outstanding and exercisable (in shares) | shares		3.1
Trust Preferred Capital Security | Market Offering Agreement | Subsequent event
New Accounting Pronouncements or Change in Accounting Principle
Maximum aggregate offering price				$ 8,000
Trust Preferred Capital Security | Air T Funding
New Accounting Pronouncements or Change in Accounting Principle
Stock issued during period (in shares) | shares	1.6
Stock issued during period	$ 4,000
Computer Equipment
New Accounting Pronouncements or Change in Accounting Principle
Property, plant and equipment, useful life		3 years
Flight Equipment
New Accounting Pronouncements or Change in Accounting Principle
Property, plant and equipment, useful life		7 years
Deicers and Other Equipment
New Accounting Pronouncements or Change in Accounting Principle
Property, plant and equipment, useful life		10 years
Building
New Accounting Pronouncements or Change in Accounting Principle
Property, plant and equipment, useful life		30 years
Commercial jet engines and parts
New Accounting Pronouncements or Change in Accounting Principle
Goodwill		$ 4,200
Corporate and other
New Accounting Pronouncements or Change in Accounting Principle
Goodwill		6,200
Overnight air cargo
New Accounting Pronouncements or Change in Accounting Principle
Goodwill		$ 100