Sue, I don't think you've ever posted anything that I disagreed with. Thanks.
Jodifla, I think it has nothing to do with the diagnosis, and everything to do with the behaviors which are dangerous, and rude.
Actually I'd leave at "behaviors which are dangerous" Rude is in the eye of the beholder and, though unpleasant, most of us can suck it up and make it through a flight with a rude fellow passenger (adult or child). Though, we might come on Disboards and rant or whine to friends, of course. Here I could see leeway given based on diagnosis. Causing a safety concern, on the other hand, is not a place for leeway.