The A-10 fighter jet was actually designed to make the GAU-8 Avenger (A 10mm 
Anti-Tank 7barrell Gatling gun) fly. The whole plane is basically a flying gun with add-on missiles!

That's the GAU-8, that MASSIVE thing stuck to the planes belly 

 
 And that's the plane, what a beast =^^= Halo fans might also be interested that the plains main nickname is "The Warthog"