Ryanair
Interesting that the aircraft routed Dublin-Cardiff-Bratislava yesterday in that the Ryanair forum is reporting a new BTS route (Eilat) announced today and an additional based aircraft at BTS from March next year.
Ryanair no longer operates Bristol-BTS. They axed it at the end of summer 2013 after a couple of years in operation despite load factors well into the 90s% most months that summer - the yield again presumably - but at least the route has a history of decent passenger numbers from the Severnside catchment.
easyJet now operates to Vienna from BRS so BTS could be a starter if the airline is intent on developing a CWL network. If full APD devolution to Wales is announced in next month's Budget I would be extremely surprised if a significant Ryanair presence does not eventuate at CWL.