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Revenue (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Operating Revenue by Geographic Region The following table presents operating revenue by geographic region (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Domestic (U.S. and Canada)
$
7,087

 
$
6,689

 
$
12,962

 
$
12,165

Atlantic
2,066

 
1,965

 
3,524

 
3,354

Pacific
1,306

 
1,285

 
2,587

 
2,516

Latin America
943

 
838

 
1,918

 
1,774

Total
$
11,402

 
$
10,777

 
$
20,991

 
$
19,809
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Total Frequent flyer deferred revenue - beginning balance
$
5,138

 
$
4,937

 
$
5,005

 
$
4,783

Miles awarded
682

 
607

 
1,289

 
1,210

Travel miles redeemed (Passenger revenue)
(589
)
 
(519
)
 
(1,027
)
 
(928
)
Non-travel miles redeemed (Other operating revenue)
(33
)
 
(36
)
 
(69
)
 
(76
)
Total Frequent flyer deferred revenue - ending balance
$
5,198

 
$
4,989

 
$
5,198

 
$
4,989