Airport Engineering
The main disadvantage of angle nose out parking configuration of aircraft is that the

Aircraft rear loading door is far away from terminal building
Hot blast is directed towards the terminal building
Overall apron area required is more
All listed here

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Airport Engineering
The capacity of parallel runway pattern depends upon

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

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