Why does this go down to 4 / week, when all the others are daily (IIRC)?
Is it down to the lack of ability to distribute pax around different airports if load factors fluctuate(eg GLA-EWR; EWR-BHX-GLA), with interline options going through BHD instead.
Or is there simply less proven demand for such flights from Northern Ireland - after all BRS, GLA, EDI etc all have regular feeders to other European hubs, whereas BFS only has the no-frills.