Hawkins: Ordinary meat is not allowed in a Kosher meal as the animals are usually stunned before being killed. Stunning is not allowed for Kosher meat. The animal must have its throat cut whilst fully-concious and then bleed to death.
Errr, that's technically correct but a mite harshly put. The deed is done to the jugular vein with a VERY sharp instrument, very quickly. The experts say death comes quickly and relatively painlessly. (Never tried it myself).
Heliplane: Dairy products ok but cannot mix dairy with milk.
Quite a trick.
Actually you can't mix meat with milk. There's kosher cheese and kosher beef, but no such thing as a kosher cheeseburger, unless the cheese is "fake".
Really, the best advice is to ring up a nearby synagogue (Conservative or Reform would be my choice, but I'm not trying to start a fight
); they'd be able to give more specific answers. A lot of people order kosher on airlines just because it's better food.