Here’s an update on the big SkyTug airship that Lockheed-Martin is developing for a Canadian venture that wants to use it to transport cargo to and from remote areas: Proposed Rules Provide Peek at Lockheed’s Cargo Airship – Aviation Week

Here are some earlier articles about the system:

• Alberta Private Company And Lockheed Martin To Develop A Family Of Hybrid Aircraft – Aviation Capital Enterprises Inc/Newswire.ca – Mar.22.11
• Enter the SkyTug -How It Works Magazine – Nov.2.12
• SkyTug Still Tugging Along – The Return of the Airship – Sept.7.12

Here is a video showing the P-791 demonstrator that Lockheed began flying a few years ago: