民用运输机按大小和航程有干线飞机和支线飞机之分。一般来说,载客量100人以上、航程超过3000公里的运输机都属于干线飞机;而载客量在100人以下,只能用于中心城市与小城市或小城市间的客货运输,则称为支线飞机。关于21世纪初民用运输机发展的总体趋势,本刊上期已经有文章作了介绍,在这里我们专门来谈谈支线飞机的现状与发展。从整个世界来看,对于干线飞机的 Civil transport by size and range of trunk aircraft and regional aircraft points. In general, the transport aircraft with a carrying capacity of over 100 persons and a range of more than 3000 kilometers belong to mainline aircraft; while the carrying capacity of passengers under 100 can only be used for passenger and freight transport between a central city and a small city or a small city Called a regional aircraft. As for the general trend of civil transport aircraft development in the early 21st century, we have already introduced some articles in this issue. Here we talk about the status quo and development of regional aircraft. From the perspective of the whole world, for the mainline aircraft