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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue

Passenger Revenue

Passenger revenue is primarily composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
2019
2018
 
2019
2018
Ticket
$
10,029

$
9,553

 
$
27,986

$
26,514

Loyalty travel awards
732

678

 
2,174

1,976

Travel-related services
649

565

 
1,872

1,617

Total passenger revenue
$
11,410

$
10,796

 
$
32,032

$
30,107



Other Revenue
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
2019
2018
 
2019
2018
Loyalty program
$
485

$
369

 
$
1,443

$
1,075

Ancillary businesses and refinery
291

433

 
990

1,475

Miscellaneous
185

129

 
536

388

Total other revenue
$
961

$
931

 
$
2,969

$
2,938
Schedule of activity in loyalty liability
The table below presents the activity of the current and noncurrent loyalty liability and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.
(in millions)
 
 
2019
2018
Balance at January 1
 
 
$
6,641

$
6,321

Mileage credits earned
 
 
2,352

2,322

Travel mileage credits redeemed
 
 
(2,175
)
(1,976
)
Non-travel mileage credits redeemed
 
 
(122
)
(125
)
Balance at September 30
 
 
$
6,696

$
6,542
Schedule of revenue by geographic region Our passenger and operating revenue by geographic region is summarized in the following tables:
 
Passenger Revenue
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
2019
2018
 
2019
2018
Domestic
$
7,971

$
7,395

 
$
22,755

$
21,093

Atlantic
2,060

1,996

 
5,042

4,837

Latin America
683

675

 
2,298

2,228

Pacific
696

730

 
1,937

1,949

Total
$
11,410

$
10,796

 
$
32,032

$
30,107



 
Operating Revenue
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
2019
2018
 
2019
2018
Domestic
$
8,651

$
8,125

 
$
24,925

$
23,480

Atlantic
2,336

2,244

 
5,788

5,494

Latin America
757

741

 
2,559

2,449

Pacific
816

843

 
2,296

2,273

Total
$
12,560

$
11,953

 
$
35,568

$
33,696