It's been my experience that the NTA FAs are the surliest of the lot. I have had way better service from the Dulles and Houston based sCO international crews. I met an FA the other day who lives in Delaware but commutes to the SFI base because those crews are better to work with (sure it doesn't hurt he's much more senior there)
For those who take 84/90 with some regularity how are the crews?