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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories at December 31 consisted of the following:
 
2017

 
2016

Long-term contracts in progress

$13,889

 

$12,801

Commercial aircraft programs
52,861

 
52,048

Commercial spare parts, used aircraft, general stock materials and other
5,688

 
5,446

Inventory before advances and progress billings
72,438

 
70,295

Less advances and progress billings
(28,094
)
 
(27,096
)
Total

$44,344

 

$43,199