Got to stop outside T1 at 7pm and asked when next coach to Sandyford would leave. Was told there should have been one at 7.25 but the coach had broken down and there now wouldn't be another till 7.55pm. After exploring our options my sister (who was outside T2)and I decided to wait till 7.55. Of course by 7.55 there was a big queue for this coach but I managed to get on at T1. Just before T2 stop the driver pulled in and counted the remaining seats. Then he sat down, drove off and skipped the T2 stop altogether. There were 13 seats free on the coach, I counted because my sister was stranded outside T2 along with a lot of very bewildered tourists. When they asked when the next coach would be they were told 'it runs every 15 minutes' by an Aircoach worker. He was either lying or didn't know what he was talking about because what I was told at T1 clearly indicated a half hourly service. Aircoach used to be a good service but looking at all the different routes within Dublin and to the likes of Belfast and Derry it's becoming increasingly obvious that you've overreached yourselves and your resources are spread too thinly. No announcements from the driver either apart from solo yell of 'city centre' at D'Olier st. Hope most of the passengers were locals!