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Mastny, Lisa . World Air Traffic Soaring. Vital Signs 1999. New York: W.W. Norton & Company, 1999.
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|Much of the world's stock of aluminum, with its light weight and strength, is invested in the fleet of commercial planes. At any given time, a substantial fraction of the world's aluminum is actually airborne. With air travel expanding at 6 percent a year, the investment of aluminum in aircraft is also expanding.||aviation mining|