STEVE ALLEN / SCIENCE PHOTO LIBRARY STEVE ALLEN / SCIENCE PHOTO LIBRARY
Boeing 747 cargo airplane taxiing on a runway. This Boeing 747 jet airplane does not have the windows of a passenger airplane, and carries cargo instead. There are about 225 Boeing 747 cargo jets in use (as of 2004), carrying around half of the world's air cargo. Photographed at Los Angeles International Airport, California, USA.
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