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Summary of Financial Statement Preparation and Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property, Plant and Equipment Property and equipment, to be held and used, is summarized as follows (in thousands):
 
March 31,
2020
 
December 31,
2019
Flight equipment
$
2,649,370

 
$
2,598,113

Ground equipment
60,400

 
59,628

Leasehold improvements, facilities and office equipment
34,173

 
33,649

Aircraft modifications and projects in progress
297,791

 
220,827

 
3,041,734

 
2,912,217

Accumulated depreciation
(1,206,558
)
 
(1,146,197
)
Property and equipment, net
$
1,835,176

 
$
1,766,020