Do you really want to get on a very long airplane ride with stomach and intestinal problems? Envision yourself in mid air, needing to quickly use the bathroom facilities, and finding a long line of passengers waiting to use the same. Even if your fellow passengers are exceptionally generous and sympathetic to your predicament (no assurances on that), you have no guarantee of perfect timing. As one who used to fly professionally, IMHO, no dive trip is worth having an intestinal catastrophe mid-air, in the middle of the ocean, with many hours to your next destination, or really at any altitude or location. Trying to do a cleanup in an airplane lavatory is no easy or pleasant feat. I can almost guarantee that is not going to end well.