Airport Engineering
According to the International Civil Aviation Organization (I.C.A.O.), the runway lengths of aerodromes, have been coded by

Last Seven English alphabets
Seven English alphabets
First seven natural numbers
First Seven English alphabets

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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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