Hi domefirst. Here's the same report for 24th May 2010...
Date | Symbol| ShortVolume| TotalVolume 24 May | KATX | 2,943,485| 7,161,271
24th May was also a green day for KATX. I could be wrong but I think this is just the MMs keeping an orderly market by fulfilling buy orders as they come in. They get three days to make good.