Someone said that when flying below the equator, the plane would just fly at a faster speed to make up the time difference, but at some point the plane would have to be flying at supersonic speeds. [EDIT: Now, I'm pretty sure passengers would be able to tell] that they're travelling faster than sound because... well... if they're travelling faster than it, then they wouldn't hear anything, but I will accept that I could be wrong. However, commercial jets, aerodynamically and engineerically (is that a word) speaking, are not capable of supersonic speeds. Not according to what the conspiracy tells us, but according to simple science available and testable by the public.
Also, explain how a jet could be flown faster than sound without the pilot (a citizen not in on the conspiracy) knowing that something is up? Are you saying that jets are built with a sensor that knows when it's flying below the equator and exponentially increases it's speed, while displaying a guage that reads half the speed it's going so as to fool the pilot?