Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways and weather conditions
Weather conditions and navigational aids available
Lateral spacing between two runways and navigational aids available
Lateral spacing between two runways, weather conditions and navigational aids available.

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Airport Engineering
Wing loading of an aircraft is

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

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