Okay, this is weird.
On March 31, Avis.com showed me as PC.
On April 2, it showed me as First.

Today, I logged back in and it shows me as PC again.

^^
And I'm a United Club Card holder. Definitely
not anything to do with the PP card.
If this sticks, I'll be very happy. And Avis will get a lot more business from me. Even if it's a mistake... as long as it's a
persistent mistake.