Ordering a "BLAND" meal from the special category would probably get you something suitable for your stomach. Most major airlines have a decent list available of everything from Jain to low salt. Usually the meals are of a higher standard than normal food and you get served first.
Prisons that have to cater for Jews will usually order in from an outside supplier as there are so few of them doing porridge that it isn't worth having a specially certified kitchen. Other prisoners have been known to claim to be Jewish in order to get better food.