Airport Engineering
Zero fuel weight of an aircraft is:

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

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Airport Engineering
Speed of

Sound at 0°C is 1190 kmph
Sound varies 2.4 kmph per degree centigrade rise in temperature
All listed here
Sound at 0°C is called one Mach

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Airport Engineering
Castor angle is defined as the angle

Between the direction of wind and the longitudinal axis of the runway
Between the horizontal and the fuselage axis
Between the true speed of the aircraft and the crosswind component
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear

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