航空公司联盟后 ,通常航线网络能得到有效扩展 ,从而使幅员扩大。在幅员扩大的同时 ,线路上运量密度也在增加。因此 ,航空公司联盟可以同时充分利用密度经济和幅员经济 ,即同时利用规模经济和范围经济 ,使航空运输生产成本得以节约 Airline alliances, the route network can be effectively expanded, so that the size of the expansion. In the same time the size of the expansion, the line traffic density is also increasing. Therefore, the airline alliance can make full use of both the density economy and the breadth economy at the same time, that is, economy of scale and economy of scope are utilized at the same time, so that the air transportation production cost can be saved