I am not real familiar with this type of activity. I noticed these chemtrails and the plane on Wed. (8-20-08) at 5:30 pm. It was in the most NW part of Las Vegas between Mt. Charleston and the most southern end of the Nellis Range. The plane was too high to identify. Any thoughts? I am guessing that it is refueling chemtrails related to the jets at the Nellis Range.