Taking control or possession of a vehicle (and the goods and/or passengers in it) from someone by force is usually known as
hijacking. The special case
of boarding a
ship from another vessel is known as
piracy.
It is not unknown for ships to be hijacked by somebody already
on board, such as the hijacking of the passenger ship
Achille Lauro by
Palestinians in
1985.
Aircraft hijacking receives the most media attention, although
hijacking of trucks and cars (carjacking[?]) is also common.