You beat me by seconds. I was going to post it since the thread was further down the list of threads but by the time I got to the bottom, your post showed up.
That someone shot it down for flying over restricted airspace or that it went over some high defense budget country without being detected or that someone was flying a jumbo jet so close to the ground that it evaded all radar or that it went thru a trans dimensional wormhole or that it's even missing?