A newly trained flight attendant doesn’t think flying between small towns will be dangerous, till he learns what happens in the cabin, stays in the cabin.

As Richiev said, ?we only get a glimpse of what the story may be about. ?The concept needs to be fleshed out with a statement of a plot.

This logline does not give us a glimpse of story.

Here would be an example of a logline structure:

"When (This happens) an (Adjective) flight attendant must (Do this) if he is to (Accomplish this) but (This bad thing) will happen if he fails."

There are of course other variations, but this would be a good example of logline structure.