Originally Posted by
LarryJ
There are dozens of codes starting with A1 and going down through D5 or D6. D3 is pretty low in the priority order of non-rev passes.
Yes - I was surprised that the pass was upgradable-for-a-fee. On CO, vendor passes for buainess travel were always positive-space and always upgradeable (the upgrade was at the lowest positive priority, but the vendor would be upgraded before any NRSA pass holder).