I rented the car from 1pm 9/16 to 1pm 9/17 online, but I was delayed getting back and tried to return the car an hour late, but the place was closed when I got there. When I picked up the car nobody bothered to tell me that the office would be closing at the exact time I was scheduled to return the car (1pm on 9/17). So when I arrived an hour late, the place was locked. There was nobody there, and there was no way to return the car on site. It created a huge hassle. I had to call Avis. At first they told me I would have to return the car the following morning when the office opened up at 8 AM. Since I was leaving town I could not do that. Eventually they allowed me to return the car to the airport, and they doubled my rental rate.