FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

FAIR VALUE MEASUREMENTS

Summary of assets and liabilities measured at fair value on a recurring basis

	March 31, 2021
	Level 1		Level 2		Level 3		Total
Assets
Fuel Derivative Contracts	$	—	$	1,205	$	—	$	1,205
Total Assets measured at fair value on a recurring basis	$	—	$	1,205	$	—	$	1,205

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Liabilities
Fuel Derivative Contracts	$	—	$	1,173	$	—	$	1,173
Total Liabilities measured at fair value on a recurring basis	$	—	$	1,173	$	—	$	1,173

	Level 1		Level 2		Level 3		Total
Liabilities
Fuel Derivative Contracts	$	—	$	1,173	$	—	$	1,173
Total Liabilities measured at fair value on a recurring basis	$	—	$	1,173	$	—	$	1,173

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets
Fuel Derivative Contracts	$	—	$	2,233	$	—	$	2,233
Total Assets measured at fair value on a recurring basis	$	—	$	2,233	$	—	$	2,233