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A car crash is much more probable than a plane crash if you take into consideration how many people will travel by car per day compared to the number who will travel by air; take into consideration how many cars with how many drivers are likely to make a mistake compared to the number of planes and flight crews.
9 planes in Cube 3 Planes in Cuboid
There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.
Infinitely many planes.
Nowdays, unfortunately, 1-3 months. well over 1500 planes take off at once and at lest 1 plane crashes but really it depends on when ever their doesn't have to be a plane crash though.