If would still question what happens during the event of an in-flight seizure? Has this risk been assessed and if there isn't a suitably trained person with the child, do you rely on there being a doctor on board or do you divert?
Considering health and safety environment + need for a specialist, I'm not sure if the former is relevant anyway, the latter poses considerable challenges.
G&T - I think there might be a big cost difference between swimming with dolphins as a tourist activity and the kind of therapy that is being offered here.
I totally agree with other comments about the entitlement culture and the lose-lose that the airlines are in, but having to care for a child that ill is still no holiday. That's why we have respite care.