I think available miles refers to how many miles you actually flown or earned for hotel and car rental (not bonus miles). Mine read about 29000 which should be about right.

The best part was to go back and look at the history of my mileage run. You have to put in specific dates. It will only tell you the date, airline/flight number, routing and date miles posted. I only got through a few dates before the server went offline but it is interesting to note that most of my miles which I flew in April/May were not posted until 30 Oct 2000.

Still need to much more research when the server is back up.

Regds
Jay