Which is weird considering there is probably less traffic and less chances of collision above 18,000 than below it. Considering the volumes of the shells and the types of aircraft that are capable of flying at over 18,000 feet.
Which is weird considering there is probably less traffic and less chances of collision above 18,000 than below it. Considering the volumes of the shells and the types of aircraft that are capable of flying at over 18,000 feet.
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