"Today the early morning rush of eastbound planes left contrails that lasted forever. Even more remarkable is the nearly perfect grid in the sky, that is being completed by a plane far away."
Misled pilot who snapped this pic thinks these are contrails making a grid pattern - OH BROTHER!
Amsterdam - Schiphol (AMS / EHAM)
Netherlands, April 18, 2007
This website airliners.net has lots of photos of 'jet trails' & 'contrails'.