We are flying into Shannon in early September for 24 days. We want an intermediate, manual, diesel. Flight gets in early. When we depart, flight leaves at noon. To keep from being charged an extra day, the thought is: do things at Shannon, such as Heritage Pass; Euros; breakfast, delaying the start time on the car rental until something reasonable. Say, 10 am. We will be behind most other folks. Does this imply that there will be fewer cars, smaller chance of getting what we want? What's the right way to play this? BTW, we're in-between Easy Tour, USAA, and Dooley.