Because bad people were driving the planes and made the planes crash on purpose.
Planes seldom crash more than once.
They are actually called "planes" on a submarine and allow it to maneuver underwater. Horizontal "planes" allow the submarine to go up/down, vertical "planes" allow the submarine to go left/right.
Crash Science - 2005 Planes was released on: USA: 19 October 2006
some ways planes crash is a storm,failing engine,a passed out pilot, and to much cargo
the reason why is because the planes were hijacked.
No because the air around the plane has pressure. If two planes take off at the same time the planes will crash. The planes might crash if they land at the same time.
this is because it is verry weak in a crash situation, and planes are not intended to crash at all,
crash
Chances of being in a plane crash are 1 in 11 million
Only about 0.000001% of planes ever crash. Generally, the drive down to the airport is much more dangerous than flying a plane.
2 planes. 1 each tower.