Is it mix up with another air line?

会不会和别的航线的行李混在一起了。

Should the air line sell it to him?

航空公司应该将这个座位卖给他吗？

This air line operates five main lines and twenty branch lines.

这家航空公司经营五条主干线和二十条支线。

Excuse me. Could you tell me where I can get air line tickets?

打搅一下。您告诉我，我能到哪里订到飞机票？

This private-owned airway is allowed to operate a new civil air line service.

这家私营航空公司获准开办一条新的民用航线。