I often fly to Oregon on the west coast of the USA from Cardiff and in general it costs me between £800 and £1100 with KLM or Aer Lingus
I regularly need to fly from Brussels to Atlanta for work. Since we're talking sterling, mostly a return fare is north of £1000.
So instead I book Brussels - Atlanta - Buenos Aires - Atlanta - Brussels: same flights, but with a couple of extra flights thrown in: £500.
My work saves £500, and I get to visit Argentina for free
Once I got a fare
Brussels - Atlanta - Los Angeles - Sydney - Brisbane - Los Angeles - Atlanta - Brussels for a little over £1000, but it was still cheaper than
Brussels - Atlanta - Brussels.
Sorry that's all off topic.
Back on topic: some great traffic figures for Dublin!