Plenty. Others are even further along... I can't talk about the one I know deeply about, but here's a public resource about another from Lockheed: http://www.lo

Plenty. Others are even further along... I can't talk about the one I know deeply about, but here's a public resource about another from Lockheed: http://www.lockheedmartin.com/us/products/HybridAirship.html http://www.lockheedmartin.com/us/products/HybridAirship.html