Originally Posted by MMM
Bit useless for that, transponder on or off it will be detected by military as unauthorised flight & dealt accordingly.
Whilst I see your point I would also ask why military didn't "deal" with it when it happened to change it's flight path and presumably not identify itself to anyone?
Also how come the military didn't "deal" with the planes that flew into the twin towers.
The military aren't just going to shoot something down that resembles a passenger airplane with hundreds of people on board without first trying to make contact and establish if it is a threat or not and even then it's not going to be the quickest process In the world.