Just a "heads-up"!

Advance reservations with this code may not be honored. I had several with it. My rental for next weekend in LAS was changed to "best rate", which was terrible. My rental for MEM in July still appears ok. I don't know if this was a specific change for LAS only, or if the Avis computer disqualifies the code when the rental time approaches.
I would keep checking your rate, if you are using it, and perhaps have an alternate booked.

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Have a nice day flying United!
ChgoBob