Most of the remaining ones are still based at DUB
. So, it's likely if you fly Ireland-UK, or Ireland-Charleroi, Girona, Malaga, Faro, Reus or Murcia, you'll fly on one.
services except CRL
also use them, and there are a couple left at STN
I believe, but I'm not sure of all the routes they are used on, but I think one of the two daily rotations to Kerry here in Ireland is on a 200.