Cork is already served by Aer Lingus Regional twice daily.
Would this really work?
I forgot about them, they seem to have gone very quiet since the news that Aer Arran was in some sort of financial trouble, that's probably why, for some reason I though they pulled off the route.
However, I don't see why bmibaby couldn't compete on any such route from MAN if they wanted to, though I guess at the minute the demand for ORK is better suited to the likes of Aer Lingus Regional with the smaller aircraft, at least for the minute anyway.