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Expendable parts and supplies (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Disclosure of Expendable Parts and Supplies
 
 
  
2020
 
 
2019
 
Material for repair and maintenance
  
$
69,737
 
 
$
66,418
 
Other inventories
  
 
4,920
 
 
 
3,686
 
 
  
 
 
 
 
 
 
 
 
  
 
74,657
 
 
 
70,104
 
Allowance for obsolescence
  
 
(338
) 
 
 
(1,004
) 
 
  
 
 
 
 
 
 
 
 
  
$
74,319
 
 
$
69,100