"In recent times there's been a resurgence of interest in airships for military and commercial uses as evidenced by Lockheed Martin's High Altitude Long Endurance-Demonstrator (HALE-D) and Hybrid Air Vehicles heavy-lift variant of Northrop Grumman's Long-Endurance Multi-Intelligence Vehicle (LEMV). Like HAV's design, this concept from Canadian company Solar Ship is a hybrid airship that relies on aerodynamics to help provide lift, and like the HALE-D, it would have its top surface area covered in solar cells to provide energy and minimize its carbon footprint."
I think Ufology has more of a problem on its hands than ever before. It appears that increasingly the "unidentified flying objects" some of us see are now far more than likely to be "ours". More can be found on this Gizmag page.