Rarely competitive if booked through a codeshare. Booking individually, sometimes you get better EI fares but if connections are short, its too much of a risk. Same as previous poster, I live less than 10 mins from Cork Airport and it also kills me to drive past it on the way to Dublin. You just can't justify a 200-300 euro difference. I took a short flight to Europe last week from Dublin, 300 euros from Dublin with BA, 650 euros from Cork connecting to the same outbound BA from LHR. It's depressing. All hub connections are via EI and they know it.