Unfortunately, Aer Lingus doesn’t fly nonstop to DFW. So you either have to change in Boston and fly Jet Blue in economy on a relatively long leg or you change in Chicago and fly a United Express flight to Dallas. With the need to clear US immigration in Dublin traveling via Boston you don’t have much time to enjoy the Aer Lingus Gold Circle lounge which is located before US immigration. Alternatively, I believe the Chicago flight is one of the ones that does not clear US customs in Dublin. So, you get time in the Dublin lounge but pay for it going through immigration and security, not to mention changing terminals in Chicago. I have flown to Dublin on an Aer Lingus connection and note their US code share partners don’t really know how to reroute you if you miss connect. And, with summer thunderstorms and frequent delays at US hubs which affect domestic flights first, the risk of a missed connection is high.