当您出国留学需要乘坐飞机时，以下是一些基本的英语表达，您可以在飞机上使用：
办理登机手续
询问办理登机手续的位置
```
Could you please tell me where I can check in？
```
提供护照和机票信息
```
Hello, I have a flight to [目的地] at [航班号]. Could you please help me check in？
```
登机后
询问座位
```
Do you have a seating preference？
I'd like a window seat.
I'd like an aisle seat.
```
询问行李认领处
```
Where is the baggage claim？
```
询问洗手间位置
```
Where is the restroom？
```
飞行中
询问饮品
```
Could I have some orange juice, please？
```
询问到达时间
```
Could you tell me the arrival time？
```
询问借用毛毯
```
Could I borrow a blanket, please？
```
到达目的地
询问如何前往目的地
```
How do I get to the departure gate？
```
询问行李
```
Where is my luggage？
```
其他
表达感谢
```
Thank you so much.
```
表达友好
```
Have a safe trip!
```
请记得，在飞机上保持礼貌和尊重是非常重要的。