航空货运业被喻为世界经济活动的晴雨表，它随着世界经济繁荣而兴旺，随着世界经济衰退而不景气。近几年世界航空货运业发展迅速，据美国波音公司预测，未来20年内世界航空货运量将以平均每年6．6％的速度增长，世界各航空公司的货机总数也将增长一倍多。在未来15年内世界航空 Airfreight has been hailed as a barometer of world economic activity, booming as the world economy prospers and declining as the world economy downturn. In recent years, the world's air cargo industry has developed rapidly. According to the forecast by the U.S. Boeing Company, world air cargo traffic will grow at an average annual rate of 6.6% in the next 20 years, and the total number of freighters in the world's airlines will more than double. World Aviation in the next 15 years