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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Rollforward of the Amounts Included in AOCI, Net of Taxes A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2023 and 2022:
(in millions)Fuel derivativesInterest rate derivativesDefined benefit plan itemsDeferred tax impactAccumulated other
comprehensive income
Balance at December 31, 2021$492 $(57)$66 $(113)$388 
Changes in fair value645 18 106 (179)590 
Reclassification to earnings(832)(2)193 (634)
Balance at December 31, 2022$305 $(32)$170 $(99)$344 
Changes in fair value(312)10 (11)73 (240)
Reclassification to earnings(128)(10)27 (104)
Balance at December 31, 2023$(135)$(15)$149 $$— 
Reclassification out of Accumulated Other Comprehensive Income
The following table illustrates the significant amounts reclassified out of each component of AOCI for the year ended December 31, 2023:

Year ended December 31, 2023
(in millions)Amounts reclassified from AOCIAffected line item in the Consolidated Statement of Income
AOCI components
Unrealized (gain) on fuel derivative instruments$(128)Fuel and oil expense
(29)Less: Tax expense
$(99)Net of tax
Unrealized loss on interest rate derivative instrumentsOther operating expenses
Less: Tax expense
$Net of tax
Unrealized (gain) on defined benefit plan $(10)Other (gains) losses, net
$(3)Less: Tax expense
$(7)Net of tax
Other$— Other
Less: Tax expense
$(4)Net of tax
Total reclassifications for the period$(104)Net of tax