I have a reservation for two weeks. Leaving this saturday. A rather expensive rent. Mini Cooper Cab. My flight was changed and my arrival delayed from 2pm to 6pm. Same day. I contacted Rental.com wednesday, to give them this information. Their response was that if I was 4 hours delayed, there will be no car for me. "You have to make a new reservation and pay 3 days for the old one caused to late annulation". I found this answer pretty absurd. I have a Voucher and makes no annulation. But they sticked to this answer and asked me to call them, to find a resolution. Have you tried to call Rental.com? It's not possible. Instead I called SIXT, pretty easy. They thanked me for the information and noted the delay. Rental.com is a farce..But I bet they will try to [censored] this up. We will see.