City to city is best if you really want to go in to the center on business.
What about Dublin as a transit point for US & European destinations ?. Very few direct services from BFS/BHD, while DUB has an ever increasing range of destinations on offer. Example, check in bags at BEL, transit DUB 1-2 hours and collect bags in JFK,BOS,LAX,ATL,YYZ,BWI,PHL etc.. or as another forum suggests, pax can link in with other Arran flights to 5 or 6 Irish regional airports.