Envisat captures a cluster of aircraft condensation trails, or 'contrails', over southern Italy, the Adriatic Sea and parts of Croatia. Image acquired 1 September 2008 by the Medium Resolution Imaging Spectrometer (MERIS) instrument onboard Envisat.
European Space Agency
<a rel="nofollow" class="external free" href="http://www.esa.int/spaceinimages/Images/2008/09/Contrail_cluster">http://www.esa.int/spaceinimages/Images/2008/09/Contrail_cluster</a>