1.Where is the departure gate? 有哪里是出发登机口

2.What time does the flight leave? 这个航班什么时候起飞？

3.Do I need to check in now? 我现在需要办理登机手续

4.Can I check in my luggage here? 我可以在这里托运行李吗？

5.Where is the security check? 安检在哪里？