Where is the 777?

My theory is that the plane landed safely, and is being hidden at an abandoned SAC base from the cold war, which had runways sufficient in length for B52s,
and 777s.  Where?  Australia is one possibility, Pakistan or Saudi Arabia another,  by flying the commercial routes and just blending in on the radar.   We have all seen Top Gun, and the two jets becoming four jets  on radar at the beginning of the movie, or was it the end?  Easy to blend in on radar.  A large tarp or prepared hanger would hide the plane easily.  It took years to plan and carry out the 9-11 attacks, this hijacking has been planned just as carefully, and who knows what person was in the 'jump' seat.  Did he drug the pilots with tainted coffee etc?  Arsenic?  Motive?  What was the cargo?  What a great bomb! Repainted to look like a USA domestic flight, using the same flight altitude and flight lanes.  They had years to plan this event.  Any ideas?