flight是可数名词吗

A short flight of steps led up to the door.

上几磴台阶就到了门口。

Birds use warm air currents to help their flight.

鸟利用暖气流助飞。

The gang took flight when they heard the police car.

这伙歹徒听见警车声就逃走了。

Our flight eventually left five hours late.

我们的班机最终晚了五个小时起飞。

They announced that the flight would be delayed.

广播通知，该航班将误点。