they can only get so big before they will fail to stay in the sky we're probably at about our limit now
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Their destinations were the West Coast so that the planes had a lot of fuel and the explosions would be bigger when they crashed.
it can fly
two planes intersect in one line, or the planes could be parallel. by the way there is no such thing as skew planes...
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.
9 planes in Cube 3 Planes in Cuboid