The pilot and copilot of the aircraft before the flight are required to have different specialties, in case one of them poisoned

The food in the aircraft - not the most delicious in the world, and you probably would not want to eat well every day. Pilots also have to eat this food every day. Food cooked on board the aircraft, it would be much tastier, but in order to save airlines prefer to feed their customers and employees already prepared, pre-packaged meals.

This airport is very strictly enforce safety rules, although the quality of the feed and food is acceptable, the risk of food poisoning still remains. For this reason, most airlines requires its pilots have different dishes - it minimizes the risk because even if one pilot suddenly something poison, the second will be able to keep the situation under control plane.

via factroom.ru