As a renter, I've usually already bought my return tickets and have to be at work the next day, so there's no chance that I'm going to extend my trip, unless I

As a renter, I've usually already bought my return tickets and have to be at work the next day, so there's no chance that I'm going to extend my trip, unless I get stuck somewhere. The company should have provisions for giving a loaner to a car owner whose car isn't returned on time, but I doubt that would be a problem very often.