We haven't assigned specific gates of a concourse to some airlines, both because we don't have that information, but also because if we assign so few gates (even in reality they might be the only one that airline use), we can't be sure those AI (not all AI package might use real world schedules) would find a place at least on the proper concourse.
So, we used the officially available information, which usually say something like "Air Canada use the E Concourse", and added its code to the whole concourse.
If you know some site which list all the specific parking used by each airline, that might be useful to know.