I receive the folllowing message from a user : Hi there, I took these shots, and more besides flying into Bristol on a commercial flight. The following are pictures attached with the email message [img:02ee8304f5]http://www.phy.ntnu.edu.tw/ntnujava/pics/pic20060225a.png[/img:02ee8304f5] and [img:02ee8304f5]http://www.phy.ntnu.edu.tw/ntnujava/pics/pic20060225b.png[/img:02ee8304f5] But I might say that the above two picture are not the same as the rainbow in the simulation. I also saw it once when I am in an airplane,too. I can not recall it's name, now.