By analogy with ground landing, it’s the controlled landing of an aircraft, like a floatplane, on a body of water.
It’s the maximum length of time that an aircraft can spend in cruising flight (expressed in hours and minutes), without needing to refuel.
It’s a portion of the atmosphere, above land or water, controlled by a country. The type of airspace depends on the flow of airplanes, the security level and the operations held there.
Vehicles that transport passengers from the departure gate to an airplane on the runway, and vice versa.
It’s an electronic device that picks up and automatically responds to an incoming radio signal. It is used to help air traffic controllers identify the aircraft.