Aircrew members may include pilots, flight attendants, flight engineers, navigators, Taccos, signallers, observers, (air) gunners, weapons specialists , loadmasters and various electronics system operators depending on the age during which the aircraft operated and the type of operations. General aviation aircraft may have only a pilot, large passenger jets may have 10 or more flight attendants and at least two pilots. Military aircraft have from one to, possibly, more than 12 crew.
Some military aircraft may have crew divisions between the flight crew and the tactical crewmembers. Large passenger aircraft operators almost always differentiate between the flight crew and the flight attendants (cabin crew).