For the past forty years, Igor Pasternak has pursued a lighter-than-air vision: to build gigantic airships that haul cargo to otherwise inaccessible parts of the planet. In high school, in Ukraine, Pasternak formed an airship club; at Lviv National University, where he studied civil engineering, he established an airship-design bureau. Eventually, he settled in southern California and started Aeros, which builds blimps for surveillance and other purposes. His prototype cargo airship, the two-hun...