Originally Posted by cactusflyer

Reports are now saying that the employee in question was part of the tow team, which means he would have known more about how to use some stuff on the airplane (namely the radio) than someone who wasn't involved in towing the airplanes around.

Flight tracking sites show the last revenue flight the airplane did was YYJ-SEA (which meant the airplane was towed after arriving in SEA), and if it was left on the north end of the airport, it was in one of the few places where there could be sufficient room to taxi the airplane out of the parking spot under it's own power.