Here is how UA decides what meal to serve you in F.

5-11am Departure, we don't care
11 - 2pm Departuer, we don't care
any other time, we don't care

The only thing UA cares about with meals is cheaper and less.

They have a system in place to tell me that they don't have the vegetarian meal I have in my record. No system in place to get me the meal.