I was on a flight to LDY the other day and I had heard a woman from Tyrone talking about going to Dublin and Knock airport to fly to London? Never mentioned going to Belfast.
So, that's an example of how people avoid the airport. Stupidly, because I can't see why you'd drive from Tyrone to Dublin for a short flight to London.
We would probably have at least a million extra passengers per annum if people who went to Dublin for short haul flights actually used their local airport.