Most airlines seem to offer a vegetarian meal as one of the standard options in F/C. My recent international flights on UA, however, have not had the option, which I found surprising. The FA told me that no airlines, not just UA, offer vegetarian as a given option.
That hasn't been my experience. Just about every airline menu I have seen in the past few years highlights a vegetarian option.
Can others weigh in? What airlines do? What airlines don't?