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Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2021
Significant Accounting Policies [Abstract]  
Summary of Estimated Useful Lives For Current Period and Comparative Period

The estimated useful lives for the current period and comparative period are as follows:

 

 

 

Useful life

(years)

 

 

Annual

depreciation

rate

 

Machinery and equipment

 

 

10

 

 

10%

 

Office furniture and equipment

 

 

10

 

 

10%

 

Computer equipment

 

4  –  3.3

 

 

25% - 30%

 

Transportation equipment

 

5 – 4

 

 

20% - 25%

 

Communication equipment

 

10 – 4 – 3.3

 

 

10% - 25% - 30%

 

Improvements on leased assets

 

 

10

 

 

10%

 
Summary of Amortization Periods For Current Period and Comparative Period

Amortization periods for the current and comparative period are as follows:

 

 

 

Period

(years)

 

Annual

amortization

rate

 

Improvements to concession assets

 

20 – 12.5

 

5% - 8%

 

Airport concessions

 

49 – 25 – 18

 

2% - 4% - 5.5%

 

Rights to use airport facilities

 

49 – 10

 

2% - 10%

 

Other acquired rights

 

44 – 48

 

2%