几点钟的飞机，用英语怎么说更专业？

What is the scheduled time of the flight?

scheduled time原定时间

the flight 班机

如果是起飞

可加 departure

即

What is the scheduled departure time of the flight?

如果是到达

departure 改为 arrival

如果用了 departure 或 arrival

scheduled 可以不用