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

First seven numbers
Last Seven English alphabets
First Seven English alphabets
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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