If you listen to the first part, a man is running to catch a plane. You hear voice over an intercom relaying flight information and sound effects emulating planes flying.

Then the engines of a plane preparing to and also taking off. Next is the obnoxious sound of a man laughing in the plane that is taking off which is the flight the first guy is running to catch. The obnoxious guy sees the first man running down the terminal and laughs.

He laughs all the way until the plane crashes! Then you hear the guy arriving at the terminal. Probably thinking holy shit I could have been on that flight and dead!