Even the Aerodrome/Area split doesn't really create much rivalry! There's a bit of banter that goes on (which discipline is the better), but you still go out and socialise with everyone from your course. You may not get to see other course members all day every day, but there isn't any rivalry involved, more just playful banter (i'd like to think so anyway hehe!)
And to answer the question on the simulator splits, your still kept in A and B groups (or at least we were). Everything is done in your "mini course", although outside work and during social hours it all blends back into one big course