航线的英文：
ship or air route

参考例句：

scheduled airline
定期航线

The air line service is to operate daily.
这条航线每天都有班机飞行。

The aeroplane had to change course because of the storm.
由于暴风雨的关系飞机不得不改变航线。

The navigator charted the course of the ship
领航员在海图上标出船的航线。

Is it mix up with another air line?
会不会和别的航线的行李混在一起了?

When a light passenger plane flew off course some time ago, it crashed in the mountains and its pilot was killed
不久前，有架轻便客机飞出了航线，在山区坠落了，飞行员丧生了。

A nonscheduled airline.
不定期航线

traffic pattern altitude
起落航线高度

I want to change the route.
我想变更航线。

The ship was blown out of its course.
船被风吹离了航线。

ship是什么意思：
n. 船，舰；宇宙飞船；飞艇
v. 以船运送；邮寄；运送，装运；上船，乘船旅行
suf. 表示状态，身份，职业，技巧，能力，手腕，群体等

The ship docked.
船靠码头了。

the belly of a ship.
轮船内部

Their ship was grounded.
他们的船搁浅了。

air是什么意思：
n. 空气；大气；天空；空间；微风；样子；神态；气氛
v. 晾；通风；广播

There was not a breath in the air.
一丝风也没有。

a nip in the air
空气中有一种刺肤的寒冷

To fish in the air
海底捞月

route是什么意思：
n. 路，路程

Which route do you take?
你走哪条路线？

A route or path across or over.
横向路横越或横跨的路线或道路

The route is well signposted throughout...
这条路线全段都清楚地设有路标。