Lost luggage ordeal
Pros: The basics for the seating and in flight were fine overall. The airlines and crew were helpful getting our family together, although we had booked separately.
Cons: The entertainment system never worked at all. When we arrived in Dublin, the car seat for our 1-year-old never arrived. Repeated calls to ask about it resulted in one voice mail and no call backs. I had to rent a car and drive to the airport an hour distant before getting anyone to respond. It cost us (1) car rental, (2) lost day of sightseeing, (3) price of a new car seat, and (4) price of a replacement car seat when we returned home as the one we could find on the trip is not legal in the US.