Forget that. If I had a three-year old with me, I'm either
a) not getting on the plane when I see them congregating at the gate, or
b) getting off the plane when I see them spreading out across the cabin.
I wouldn't be sitting around and hoping for something not to happen with my family at risk.
Sorry, I was assuming I was already on the plane and it had taken off.
I'm a very infrequent flyer (maybe ten round-trips in my life), and I'm damned glad I don't have to make these decisions about remaining on planes when suspicious characters come on board. But it's obvious that it's going to take another 9-11 for us to really get serious about terrorism.