Holy fuck people. If you jump up in the air in a plane, you come down in the same place (close to it) because you are moving at the same speed as the plane. If the plane decelerates from 500MPH to 0MPH in a short distance such as plowing into the side of a mountain... you certainly continue forward at 500MPH. If it slows down, while you are suspended in the air, obviously you move forward because you are then moving forward faster than the plane. I mean this Sesame Street level physics here.
