Supposedly this "trick" works on airline flights, too.

it's not a trick on a flight. you just request the type of meal you want from the airline, usually 24 hours before the flight. they don't make you recite blessings or koran verses... you just ask and they accommodate you :)

most airlines that fly long routes offer a ton of different menus: kosher, halal, vegetarian, vegan, asian vegetarian (my favorite - usually indian food, which still tastes good when microwaved as opposed to a lot of non-first-class airline meals), lactose-free, gluten-free, diabetic-friendly... many options available that are usually a cut above the typical "chicken or beef".

beware - you have to do this for each leg of a flight with layovers! i've occasionally had luck requesting a vegetarian or vegan meal in-flight but most of the time they only pack as many as are requested ahead of time.