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Revenue Recognition (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block] The following table provides the revenues recognized by revenue source for the three and six months ended June 30, 2020 and 2019 (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
2019
 
2020
2019
Passenger revenue
 
 
 
 
 
Passenger travel
$
145

$
1,936

 
$
1,553

$
3,649

Loyalty revenue - air transportation
25

95

 
129

184

Other revenue
 
 
 
 
 
Loyalty revenue
38

49

 
88

93

Other revenue
7

25

 
33

51

Total revenue
$
215

$
2,105

 
$
1,803

$
3,977


For the three and six months ended June 30, 2020, TrueBlue® points earned from ticket purchases are presented as a reduction to Passenger travel within passenger revenue. Amounts presented in Loyalty revenue - air transportation represent the revenue recognized when TrueBlue® points have been redeemed and the travel has occurred. The corresponding amounts within the three and six months ended June 30, 2019 have been reclassified to be comparable with the current period presentation. These reclassifications do not impact total passenger revenue.
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Our contract liabilities primarily consist of ticket sales for which transportation has not yet been provided, unused credits available to customers, and outstanding loyalty points available for redemption (in millions):
 
June 30, 2020
 
December 31, 2019
Air traffic liability - passenger travel
$
1,047

 
$
929

Air traffic liability - loyalty program (air transportation)
676

 
661

Deferred revenue
40

 
10

Total
$
1,763

 
$
1,600


The table below presents the activity of the current and non-current air traffic liability for our loyalty program, and includes points earned and sold to participating companies for the six months ended June 30, 2020 and 2019 (in millions):
Balance at December 31, 2019
$
661

TrueBlue® points redeemed
(129
)
TrueBlue® points earned and sold
144

Balance at June 30, 2020
$
676

 
 
Balance at December 31, 2018
$
580

TrueBlue® points redeemed
(184
)
TrueBlue® points earned and sold
221

Balance at June 30, 2019
$
617