3 theories which were discussed long ago on this forum were;

1- the planes were shoot down over the ocean as practiced in wargames

2- flown into the north pole (or whatever the hell that place is called) as reported by CNN where planes were spotted on radar the day after 9/11,

3- the planes landed somewhere and everyone on board was wacked (mysteroius plane landed at an airport somewhere)


The only thing that's fo sho is that if you have control of the most powerful most well trained/funded military in the history of mankind, making 2 passenger planes disappear shouldn't be very hard to do.