There is a feature on everlasting flight here: http://www.newscientist.com/article/mg16722484.500-everlasting-flight.html http://www.newscientist.com/article/mg

There is a feature on everlasting flight here: http://www.newscientist.com/article/mg16722484.500-everlasting-flight.html http://www.newscientist.com/article/mg16722484.500-everlasti... It makes a bit more sense to have forever-hovering lighter-than-air craft [LTA]. You can learn more about it here: http://www.defenseindustrydaily.com/cat/aircraft/blimps-lta-craft/ http://www.defenseindustrydaily.com/cat/aircraft/blimps-lta-... The efficiency challenge of the Zephyr is the really interesting part. People have no idea how big of an impact these systems will have. In-orbit satellites just can't compete with the cost and ease of LTA deployment. The applications include constant surveillance, much better GPS,and better wireless communication infrastructure.