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Contrail is the condensation trail []

Contrails.nl: Pictures of Contrails and Aviation Cirrus (-Smog), from 1995 on.

Abstract of article in Nature announcing research results of contrail temperature change study

Clouds Caused By Aircraft Exhaust May Warm The U.S. Climate

Effects of contrails on ground astronomy

Contrail simulator (Java applet) – interactively shows how temperature and humidity of the surrounding air affect contrail formation and characteristics

Contrails: What's Left Behind Is Bad News, article by Nick Onkow from March 4, 2006