PlaneFag - stop. You're embarrassing yourself.
Below a certain altitude, the track stops/disappears. Always "lands" short of the airport, and "takes off" miles from the airport.
Some tracks just suddenly disappear over the ocean or in remote areas. That's not a UFO abduction or a crash. They have simply gone out of radar range, or in the case of military planes, have left a commercial corridor and have "gone dark."