I took the aircoach going to and back from Dublin to Belfast. Going to Belfast was fine, the bus was full but that can't be helped. Returning was where things went wrong. The bus was 25 minutes late, took around 25 minutes for everyone to get off, offload luggage, onload luggage and get on so we were already nearly 50 minutes behind schedule. About an hour in the journey a passenger began to feel sick so the bus pulled over on the motorway for another 20 minutes. People were upset and this route goes through Dublin Airport and a woman expressed that she had a flight at 4pm (this was about 2:40). I also had a train at 4pm from Heuston which I ended up missing.