As to flying back shortly after diving, it's a personal judgement of course, but the local planes never go higher than 1500ft and if you ask nicely will often stay much lower than that. Do your dives on nitrox and you really have very little to worry about. But of course it remains your risk.
Peter, I don't think advising people to fly after a dive is wise,
or flying after a dive is wise.
Its definitely breaking all the rules and regulations of flying and diving.
Hopefully these people are intelligent certified divers and know better.
AmbergrisCaye.com 
