So, unfasten your seat belts and wait for his call. And keep calm.

7 seconds sound clip from the The High and the Mighty (1954) movie soundboard.

You can hear this line at 01:16:58 in the DVD version of the movie.

Quote context

[...]

- When we actually go in, there will be two shocks.

- If you know about them in advance, they won't frighten you.

- The first will be hardly noticeable, like a normal landing.

- But the second may be quite severe, so brace yourselves.

- Soon after that, the lights will go out, but Miss Spalding and Mr. Wheeler both have flashlights.

- So, unfasten your seat belts and wait for his call. And keep calm.

- Now, is there anything you don't understand?

- Could we send a radio message to our families? They were gonna meet us at the airport. They will just be standing.

- I'm sorry, our radio is extremely busy giving our position and contacting the rescue plane.

- I've some important papers in my briefcase, many years of work. Can I take them with me?

[...]