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A steward or a stewardess.
They used to be called stewardesses, and all were females. Now, they are called flight attendants who can be males or females.
That is one of the functions of the stewardess or steward
A "Pilot" is a person who drives a plane.
Pilot.
pilot
passenger
soda jerk
The navigator.
The Pilot.
That person is a 'flight attendant'
A person who serves of his or her own free will is officially called a volunteer.