I agree with DCAorBUST. It sounds like you have a major production happening, so I would get to the airport in real good time. When you check in, I would first talk to an agent about the aircraft. In my opinion, that will be the least of your problems. While I was checking in, I would ask for assistance to get your son through security. I was in a wheel chair after surgery several months ago, and although I could move, I was on crutches. TSA wouldn´t allow the wheelchair to go through the screener and they wouldn´t let me take my crutches through. So I had to hop through. Your son obvously cannot do that, but the TSA folks can be awfully demanding about the ´rules´, and I´ve noticed that they make many of them up as they go. Perhaps one of our airline employess could comment on the security issue, because I see TSA a lot more difficult to deal with than US airways.