by 
BagmanBob
ANSWERS: 4
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I think mostly because of birds because if 1 a bird is sucked in a jet engine the plane could crash :(
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For safety and, in the case of jet planes, to save fuel.
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because if they did that 1000's of feet under water they would be subs.
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That is where the stratosphere layer of the atmosphere, and this is where they can fly over weather patterns.
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