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Leases (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Capital Leases Aircraft Included In Property And Equipment
Amounts applicable to these aircraft on capital lease that are included in property and equipment were:

(in millions)
 
2017
 
2016
Flight equipment
 
$
1,207

 
$
923

Less: accumulated amortization
 
172

 
82

 
 
$
1,035

 
$
841
Future Minimum Lease Payments Under Capital Leases And Noncancelable Operating Leases
 
(in millions)
 
Capital
leases
 
Operating
leases (b)
 
Subleases
 
Operating
leases, net
2018
 
$
107

 
$
359

 
$
(102
)
 
$
257

2019
 
106

 
331

 
(98
)
 
233

2020
 
105

 
264

 
(78
)
 
186

2021
 
100

 
155

 
(41
)
 
114

2022
 
96

 
85

 
(17
)
 
68

Thereafter
 
416

 
177

 
(8
)
 
169

Total minimum lease payments
 
$
930

 
$
1,371

 
$
(344
)
 
$
1,027

Less amount representing interest
 
150

 
 
 
 
 
 
Present value of minimum lease payments (a)
 
780

 
 
 
 
 
 
Less current portion
 
79

 
 
 
 
 
 
Long-term portion
 
$
701

 
 
 
 
 
 
* See Note 4 for further details
 
 
 
 
 
 
 
 

(a) Excludes lease incentive obligation of $105 million.
(b) Includes 15 remaining Classic aircraft on operating leases, which net remaining lease payments were included in the $63 million grounding charge recorded during 2017.