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| MLA: | Mastny, Lisa . World Air Traffic Soaring. Vital Signs 1999. New York: W.W. Norton & Company, 1999. |
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| APA: | (APA style citations are not yet implemented.) |
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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 |