We rented a car from Budget, picking it up in Florence and dropping it off in Rome. We got a good rate 248.50 Euros. Our flight was delayed, and I called Budget as a courtesy to let them know that we'd still need the car, but would be picking it up 18 hours later. Never did they say anything about changing the rate. When I got my bill when I dropped the car off, it was for 539.25 Euros. They said that even though I picked the car up within the 24 hours, they had to rebook (It would have been nice if they'd told me). I'm a Gold Plus Hertz member, I've done this with them and have never had problems as long as I picked the car up within the 24 hour time frame. Apparently Budget doesn't think this way...Just thought I'd give you a heads up if your flight is delayed.