If you're a USAirways Preferred Member (USAirways Silver Elite, Gold Elite, Platnium, or Chairmans)... Here's a new code:
MUAA044 - 3000 bonus miles... valid 1/1/10 - 3/31/11 - 3 day minimum rental.
http://www.avis.com/car-rental/conte...rpreferred2010