I bet cars "borrowed" from Enterprise can stay with National, or vice versa, if they are "normal" cars, and as long as mileage meets the criteria for each brand. Ex no 40k mi cars at National, but may be fair game for Enterprise.
Also keep in mind that some of the cars city National offices take from surrounding Enterprise local stores may never come back to that particular branch, but could be one-wayed somewhere entirely different. Even where predominant city patterns tend to be locals shopping or touring on weekends, you might be surprised. Last month I did a Budget one-way from Times Square to JFK. Unusually, the car had NY plates. (Most don't. I later checked the glovebox, and saw the car was registered to LGA originally.) The agent said I'm correct, but they recently bought some new stuff. But it doesn't matter. The week before me, he had another customer going to LAX. A NY-plated car was what was available, so it's gone.
Last edited by Auto Enthusiast; Feb 28, 2020 at 9:32 am