They used to be called stewardesses, and all were females. Now, they are called flight attendants who can be males or females.
Pilot
That person is called a Pilot.
soda jerk
A Glider.
Passangers
A person who serves of his or her own free will is officially called a volunteer.
Someone who serves food is called a "waiter" or a "waitress" and sometimes called "staff".
That person is a 'flight attendant'
server aka waiter/waitress
A steward or a stewardess.
The term is, "Passengers embark"
A pilot.