After David (Matthew Broderick) "escapes" from Cheyenne Mountain, Jennifer meets him at Grand Junction Airport. The intro to this scene has the camera follow a propeller plane landing to the left before picking up David walking to the right. The only problem is the jet sound effect for the landing propeller plane.
The plane landing is actually a turboprop, engines that are driven by jet engines. Although there should have still been a slight sound of a propeller, there is no reason to believe that it would sound like a jet engine.
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