[Real Cynic No More]

"Why and how would the pilot or someone else press the "hijacking button" by accident?

Maybe as an initial distraction?

[Int]

So you're thinking people connected to the hijackers pressed these buttons? But why haven't we heard them being arested?

[Int]

More clues here:

'Other acts of terrorism were planned'
...Vice-President Dick Cheney said at the weekend that the White House was told as many as six rogue aircraft were in the sky at some point last Tuesday morning. The hypothesis is that other hijacking teams had to abort their plans after planes were grounded by the Federal Aviation Authority..."

But I still don't understand why there weren't any arrests after these 'extra' incidents