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POPS contrail.gi.alaska.edu 
Condensation trails (contrails) formed by aircrafts are sometimes visible from the ground for several hours. Numerous contrails are formed in the vicinity of main air- traffic routes; due to additional spreading effects contrails may contribute significantly to the total cloud cover. Continuous observational methods are used to study the formation of contrails in the subarctic setting of Fairbanks, Alaska. Since March of 2000 a contrail database has been established, which includes contrail characteristics, Federal Aviation Administration flight data, and atmospheric measurements derived from radiosonde ascents at Fairbanks International Airport. The contrail analysis is based on all-sky digital camera imagery and direct observations of aircrafts. Daily Overflights for Fairbanks, AK airspace. Note: Page was updated for the last time by Martin Stuefer, 13.Apr.2006. The flight data is no longer being updated. However, the flight archive is available. http://contrail.gi.al
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POPSSeptember's Science: Shutdown of airlines aided contrail studies Week of May 11, 2002; Vol. 161, No. 19 , p. 291 "Immediately after four hijacked airliners slammed into New York's World Trade Center, the Pentagon, and a field in southwestern Pennsylvania, the Federal Aviation Administration shut down all U.S. commercial air traffic for 3 days. The unprecedented grounding of airliners enabled airports to step up security measures. At the same time, scientists stepped up to a unique opportunity to study the influence of high-flying aircraft on Earth's climate."
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POPSIN REMEMBRANCE… I too, remember. And that one lone contrail - that one lone cloud over America. Up here in Canada, spaghetti jetclouds. NoCloud: http://www.pediascribe.com/sun.jpg Cloud: http://www.pediascribe.com/umbrella.jpg