Airport Engineering
Zero fuel weight of an aircraft is:

Less than empty operating weight
Equal to empty operating weight
Equal to sum of empty operating weight and the maximum pay load
Equal to maximum landing weight

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

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