Apparently he passed out on the plane early in the flight and was unresponsive for 40 minutes. A heart surgeon on the flight said he couldn't find a pulse and suspected something heart-related. They gave him an IV and oxygen mask for the remainder of the flight, then transferred him to a nearby hospital. The hospital tests didn't turn up any heart problem markers, so it's more likely he had another seizure. He was released from the hospital on Sunday after being given the human equivalent of a horse tranquilizer, but now the fun begins: follow-up with a neurologist, discussing long-term strategies, possible lifestyle changes and/or medication (which has side effects, of course), etc., given that the first seizure turned out NOT to be a one-time occurrence.
I feel fortunate that he doesn't appear to have something more serious, like a brain tumor, but this will be complicated, nonetheless. If you have a moment, please keep us in your thoughts. I have no idea if they'll have any tangible effect, but it makes me feel a little better, and I figure it can't hurt. :)
Thanks for listening, and I hope you are happy and healthy.