I flew from Guangzhou to Beijing this morning

乘飞机───by air;今早───this morning

You'd better go by air, it's very quick.───最好是乘飞机, 那样十分快.

Ten crates were shipped off by air freight last week.───上周有十篓货空运去了.

to send goods by air freight───空运货物

You can freight your belongings by air or sea.───你可把东西经空运或海运运去.

I came by air and it was tiring.───我坐飞机来的，那真累啊。

A dozen crates were shipped off by air freight last week.───十二篓上星期已空运走了.

Will you travel by sea or by air?───你们乘船去,还是乘飞机去?

Casualties had to be brought to hospital by air.───伤者不得不用飞机送往医院。