It depends on what kind of jet or commercial airplane it is.
The first jet airplane was designed in Germany in the early 1940's.
Boeing made the first JET airplane with its Boeing 707, or Dash 80 as it was called before.
Gravity.
#712
The airplane began to develop with the army and with the jet flyers.
Gulfstream makes the G550 airplane.
it is a type of fuel
1939
3
A jet IS an airplane. These days many, but not all passenger planes are jets. Many small ones are piston engined.
Depends on what airplane the jet engine is mounted in.