Theres a Belfast - DSublin bus every half hour. I think Air Coach is every hour on the hour, whilst Ulsterbus /Bus Earann (joint service) leave every hour at half past. I use them often when flying out of Dublin. Only problem is the traffic near Newry is hectic due to road works. Miles of traffic, with some idiots cutting the traffic using the hard shoulder. When in the traffic, which is at stand still, the buses will drive half on the hard shoulder, half in lane, in order to prevent people cutting past the traffic.
There are two spotting humps there, the first one closest to the terminal has been ruined by the mentioned higher fence, yet the 2nd place 2 minutes walk down the walk has not been effected by the new fence and offers some great views of departures and arrivals. I recommend going down, it's like a mini Manchester there.
