I am a vegan. I usually choose the non-dairy veggie option. The airlines rarely get it right even in biz class. I often get a garden salad thick with shredded cheese. It is easy enough for me to put aside the tabs of butter, the tub of cream cheese (with the bagel) and the carton of milk that comes with the breakfast cereal. I just wish they wouldn't waste it on me since I don't use those things.
I was once served a duck and some veggies in a broth on a flight from Hong Kong to Seattle. It was marked: "no meat meal".