The AC-130 is the world's biggest flying artillery gunship - nicknamed 'Hell in the Sky.' With three side-firing weapons, a 25mm gatling gun, a 40mm Bofors cannon, and a 105mm howitzer, it's easy to see why it got its name. Air Warriors: AC-130 airs tonight at 8 PM. | Smithsonian Channel Aviation Nation

The Lockheed AC-130 is a heavily armed, long-endurance, ground-attack variant of the C-130 Hercules transport, fixed-wing aircraft. | War History Online