Airport Engineering
According to I.C.A.O. the recommended length of air ports is decided on

Sea level elevation
Effective gradient percentage
Standard sea level temperature (15°C)
All listed here

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Airport Engineering
Wing loading of an aircraft is

Gross total weight of the aircraft/ load of the wings
Load of the wings
Gross total weight of the aircraft/ wing area
Gross total weight of the aircraft/total available H.P of engines

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