Sky Writing - 21st Century Style

[Wing_Z]

It's like a giant dot-matrix printer...they fly formation and computer control triggers puffs of smoke at the right places.
http://online.wsj.com/video/the-hig...ing/6E3B1371-B49D-4886-AF89-2C94018CC879.html

A far cry from the dizzy '30s version.

 

[Piglet]

They been doing that for years. Even back in the early 90's...