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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
Comprehensive income (loss) includes changes in fair value of our aircraft fuel derivatives which qualify for hedge accounting and unrealized gain (loss) on available-for-sale securities. A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the three months ended September 30, 2024 and 2023 is as follows (in millions):
Aircraft fuel derivatives (1)
Available-for-sale securitiesTotal
Balance of accumulated loss, at June 30, 2024$— $(1)$(1)
Reclassifications into earnings, net of taxes of $0
2 — 2 
Change in fair value, net of taxes of $(1)
(4)— (4)
Balance of accumulated loss, at September 30, 2024$(2)$(1)$(3)
Balance of accumulated loss, at June 30, 2023$(5)$(1)$(6)
Reclassifications into earnings, net of taxes of $(2)
(5)— (5)
Change in fair value, net of taxes of $6
15 — 15 
Balance of accumulated income (loss) at September 30, 2023$5 $(1)$4 

    (1) Reclassified to aircraft fuel expense.
A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the nine months ended September 30, 2024 and 2023 is as follows (in millions):
Aircraft fuel derivatives (1)
Available-for-sale securitiesTotal
Balance of accumulated loss, at December 31, 2023$(3)$(1)$(4)
Reclassifications into earnings, net of taxes of $1
6 (1)5 
Change in fair value, net of taxes of $(1)
(5)1 (4)
Balance of accumulated loss, at September 30, 2024$(2)$(1)$(3)
Balance of accumulated income (loss), at December 31, 2022$1 $(1)$— 
Reclassifications into earnings, net of taxes of $(1)
(2)— (2)
Change in fair value, net of taxes of $4
6 — 6 
Balance of accumulated income (loss), at September 30, 2023$5 $(1)$4 
(1) Reclassified to aircraft fuel expense.