http://www.airliners.net/aviation-forums/general_aviation/read.main/5155319/

"Bloomberg,: Looks like we can see all Planes now !
Private-plane owners will no longer be able to cite privacy and instead must provide a “valid security concern” to have flight information blocked from public viewing, the U.S. Transportation Department said.

The registration number, flight path, departure point, destination and flight length will be accessible to the public unless operators and owners provide the Federal Aviation Administration “written certification” that it would create a security threat, the Transportation Department said in a statement today. The change will take effect 60 days from publication in the Federal Register. "