For reasons that can't be changed, we are flying out of Shannon but will be in Dublin at the end of our trip to meet friends. Our flight is Sunday at 1130 am back to Philadelphia. We're having trouble figuring out what the best way is to get to Shannon airport Sunday morning. Is there a direct train from Dublin to Shannon? Would we have enough time if we left early Sunday morning? If we have to cut a night from Dublin to get to Shannon (or somewhere nearby) Saturday night, we're ok with that too. Any advice you can provide is greatly appreciated. Thank you!