The Belfast market has lost easyJet's summer flights to KEF, so currently there is scope for BHD's Icelandair flights to do quite well in the long run.
The main question is whether Icelandair or WOW air will win in the fight for Dublin, and whether Aer Lingus will try to enter the market. Icelandair and WOW air are mainly trying to cater for transfer passengers, so there is some scope for quite a lot of weekly rotations.