Re: CORK
While a parallel taxiway is very desireable, I'm not so sure why the lack of one is a particular barrier to Transatlantic. I agree with the need for CAT3 but I don't think the airlines are putting any great pressure on for its introduction.
In fact Aer Arann and BMI Baby refuse to avail of the CAT2 facilities at the airport. The latter seem to vary their RVR CAT1 landing limits according to the mood of who ever is flying the plane.