Letter by Louise E. Maillett, Acting Assistant Administrator for Policy, Planning, and International Aviation, Federal Aviation Administration, U.S. Department of Transportation, August 17 2001
http://en.wikipedia.org/wiki/Jasper_Kirkby Dr Jasper Kirby explains Prior and Ongoing Atmospheric Geo-Engineering by Jet Planes Member of the "European Organization for Nuclear Research" (CERN), Geneva, November 2012 "These are not smoke trails, these are clouds which are seeded by jets dumping aerosols into the upper atmosphere"
"This April 13, 2013, file photo shows a NASA Global Hawk robotic jet in a hangar at Dryden Flight Research Center in Edwards Air Force Base, Calif. The Federal Aviation Administration announced six states on Monday, Dec. 30, 2013, that will develop test sites for drones, a critical next step for the march of the unmanned aircraft into U.S. skies. (AP Photo/John Antczak, File)"