Aer Lingus and Ryanair are Irish. BFS and BHD are in the UK and many UK airlines have bases or operate from BFS/BHD -Easyjet and Flybe are the largest but Jet2 and bmi also have bases and Tomson and Thomas Cooke plus Loganair operate into BHD/BFS (and I think Aer Lingus got a UK operating certificate when it moved to BFS). I have not mentioned Manx2 as the status of the island is a bit hazy)