Just fyi, brief Q&A article in 3/28 LATimes Travel Section regarding United customer service and TSA watchlist, that begins:

Check, please: I am a "road warrior," traveling three weeks out of the month. I am a premium customer on American and Delta, but I am always pulled out for extra security on United. I am a 61-year-old white-bread multi-generation American. I asked a United customer service rep to explain this and was told to call up George Bush and ask him. What can I do?

http://travel.latimes.com/articles/la-trw-spot1apr01