On most airlines these days the catering, in terms of meal portions, is liberally dosed with either loperamide, diphenoxylate/atropine or loratadine. This ensures that passengers, generally, have a safe and comfortable flight, untroubled by any unpleasantness which they might have contracted by way of an intestinal infection either en route or prior to departure. Aircraft meals thus serve an extremely useful sociological function without which embarrassment of a ghastly eructational or even green slimy and ghoulish nature might be more common place. So eat hearty on board and put up with the occasional bout of post long haul phantom constipation.