After the shoot out at the airport they jump on the plane and fly to Mexico under the radar detection height. Swayze tells the pilot to fly to 4,000 feet in order for his injured mate to have a safe jumping height out of the aircraft. swayze pushes him out and then jumps out himself followed by Utah. They seem to free fall for a long time and that 4,000 feet turned out to be a very long way down. It was obvious that they jumped from a much greater height.