In 2008, the "CA-150" airship was launched by Vantage Airship. A non-rigid airship or blimp deflates like a balloon as it loses gas. Zeppelin patrolling had priority over any other airship activity. Commercial use of an unmanned airship must be certified under part 121. The "Hindenburg" was the largest airship ever built. Lockheed Martin made the first flight of their secretly built hybrid airship designated the P-791. In November 1917 the naval airship L 59 arrived. The Zeppelin NT is a "semi-rigid" airship. They were just shorter than the German hydrogen-filled airship "Hindenburg". Of the 12 crewmen in the bow of the airship, only three survived. The trio look for a working airship and a pilot to steer it. Boats would have their tactical parameters of each design determined by photographs from an airship. Vaan dreams of someday becoming a sky pirate in command of his own airship. All 19 crew died, many jumping from the burning airship. He disappeared while taking part in a rescue mission for the airship in 1928.