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Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income The differences between Net income and Comprehensive income for the three and nine months ended September 30, 2024 and 2023 were as follows:
 Three months ended September 30,
(in millions)20242023
NET INCOME$67 $193 
Unrealized gain (loss) on fuel derivative instruments, net of
  deferred taxes of ($14) and $41
(50)135 
Other, net of deferred taxes of $— and $2
Total other comprehensive income (loss)$(48)$143 
COMPREHENSIVE INCOME$19 $336 

 Nine months ended September 30,
(in millions)20242023
NET INCOME$204 $717 
Unrealized loss on fuel derivative instruments, net of
  deferred taxes of ($12) and ($45)
(42)(150)
Other, net of deferred taxes of $1 and $6
Total other comprehensive loss$(37)$(143)
COMPREHENSIVE INCOME$167 $574 
Schedule of Rollforward of the Amounts Included in AOCI, Net of Taxes
A rollforward of the amounts included in AOCI, net of taxes, is shown below for the three and nine months ended September 30, 2024:
(in millions)Fuel derivativesDefined benefit plan itemsOtherDeferred tax impactAccumulated other comprehensive income (loss)
Balance at June 30, 2024$(125)$149 $(11)$(2)$11 
Changes in fair value(79)— — 18 (61)
Reclassification to earnings15 — (4)13 
Balance at September 30, 2024$(189)$149 $(9)$12 $(37)

(in millions)Fuel derivativesDefined benefit plan itemsOtherDeferred tax impactAccumulated other comprehensive income (loss)
Balance at December 31, 2023$(135)$149 $(15)$$— 
Changes in fair value(108)— — 25 (83)
Reclassification to earnings54 — (14)46 
Balance at September 30, 2024$(189)$149 $(9)$12 $(37)
Schedule of Reclassification out of Accumulated Other Comprehensive Income
The following tables illustrate the significant amounts reclassified out of each component of AOCI for the three and nine months ended September 30, 2024:
Three months ended September 30, 2024
(in millions)Amounts reclassified from AOCI
Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components
Unrealized loss on fuel derivative instruments$15 Fuel and oil expense
Less: Tax expense
$11 Net of tax
Other$Other operating expenses
— Less: Tax expense
$Net of tax
Total reclassifications for the period$13 Net of tax

Nine months ended September 30, 2024
(in millions)Amounts reclassified from AOCI
Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components
Unrealized loss on fuel derivative instruments$54 Fuel and oil expense
13 Less: Tax expense
$41 Net of tax
Other$Other operating expenses
Less: Tax expense
$Net of tax
Total reclassifications for the period$46 Net of tax