Arriving at around 7 a.m. from flight from JFK to Dublin, is 9 a.m. a good time for the car rental pick up? I know there is always a possibility of airline delays and getting baggage, so my question is if we arrive at the Hertz counter earlier than 9 a.m. will we have to wait till 9 a.m. to get our car. Also, it is hard to estimate the car rental drop off time the night before our flight as we will be travelling back to Dublin from Killarney with stops to Blarney Castle and maybe Rock of Cashel. I put a 7 p.m. return but probably will get back to Dublin Airport much earlier because we plan to leave Killarney around 7:30 a.m. to be at Blarney Castle when it opens. Again, is that going to be a problem if the drop off time is wrong at the Hertz car rental counter?