We have a reservations with National for 10 days (Sat 11pm - Tuesday 7am). Our airline rescheduled our flight and we need to pick up 6 hours earlier and drop off 4 hours later. When I called National I was told our rate would more than double if I made changes to the reservation (got a tremendous deal on a minvan with original reservation: $199/wk + $33.33 per extra day). I was told to keep the original reservation and that I could extend the rental after I pick it up and they would just charge the daily rate. Can anyone tell me: 1) If I arrive 6 hrs early to pick up the car, will they honor my original reservation and give me the car early for the same rate? 2) I am an Emerald Club member, do I have to go to the counter to pick up the car early? 3) Do I have to extend the rental if I am going to drop off a few hours later, or do I have until 11 pm (original pickup time) on the last day to drop off the car? 4) If they charge me an additional day, is it the daily rate on the original rental agreement ($33.33/day), or the "going rate" (currently $78.99)? 5) Am I best off reserving another car to pick up when we arrive, then returning to the airport the next day to pick up original rental? How long will they hold a reservation? I want to pick up at 5 pm on Sat and return at 11 am on Tuesday, which is still a 10 day rental, and not be charged a different amount. What are my odds? I appreciate any insight anyone can provide. This is totally stressing me out. My rant about Delta and their horrid schedule change is coming soon.