O&D : Origin and destination generally used to describe a flight on which passengers are either boarding or disembarking at particular stops (as distinct from those remaining on the aircraft to go to another destination or connecting).
P2P or point-to-point: Any flight that takes a passenger non-stop from point of origin to destination is a point-to-point flight. Point-to-point services do not eliminate hubs; they reduce the need to change aircraft at an intermediate airport.
Aerospace medicine : That branch of medicine dealing with the effects of flight through the atmosphere or in space upon the human body and with the prevention or cure of physiological or psychological malfunctions arising from these effects.
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