If more helicopters are added, then more cars should be added as well. At the moment, RC often devolves into the President running for a new car that is very far away, so helicopters would make killing the President easier (it's not a problem at the moment because the only Maverick is in the cop spawn).
Why not add more aircraft in general? I suggested scattering Cropdusters around RC and FC a while back, but other things like the Stuntplane and Dodo would be nice too.
I think the lack of air vehicles helps the map in a way, making places harder to reach (for example the UFO).
I can also see this perspective. I think it should either be more aircraft in general, or kept the same to preserve RC's weirdness.
Cops have the airport armor in their rearguard, so they are unlikely to be intercepted while driving up for armor, at least at the very beginning of each round.
Terrorists and civilians' only alternatives to main armor are the airport armor and the UFO. The airport armor requires to drive all along the map from East to West unarmored, which involves the risk of finding armored cops on the way (and this is likely to happen, since the map is quite narrow from South to North...). The UFO requires a boat. Boats resistance to bullets is ridiculous, their explosion is huge and once it happens you end up in water and hopeless. Trying to get to the UFO from terro spawn makes you an easy prey for any nearby cops.
I think adding some air vehicles in some place which is hard to reach for cops but easy for terrorists and civilians would be a good idea to solve the problem and provide these teams a safer way to Western RC.
+1
Since when has the game been about getting armor? Instead of using a helicopter to get armor and/or get to the pointless DMing faster, how about skipping the armor and easily killing the President while the Police are "defending" an armor spawn that has little relevance to the actual game mode? You're making PTP sound like a mindless Red vs Blue server. Believe it or not, you don't have to go to the armor spawn- it's certainly not my priority most of the time.