When the refueling plane comes, the camera is outside the plane. The plane is at 30,000 feet, and the clouds can be seen not far under the plane. when the plane is told to drop to 15,000 and the guys in the back of the plane open the parachute door, the clouds are in the same position. For this height (15,000) this is almost correct, but at 30,000 the plane would be high above the clouds.