A winged fighter that hasn't lost a fight in 26 years, a lifesaver that's part plane and part chopper, and an attack helicopter our enemies call the Black Death. These are America's undisputed kings of the sky: the F-15 Eagle, the V-22 Osprey, and the AH-64 Apache. And their success stories are as remarkable as they are improbable.

The fourth season focuses on the the F-16 ‘Fighting Falcon’, one of the premiere fighting jets in the world.; the B-52 Stratofortress has been a bomber that instilled fear and panic in our enemies, capable of carrying over 70,000 pounds of weapons, can fly at 50,000 ft and over 6,000 miles long; and the P-51 Mustang, fast, nimble, beautiful and lethal, arguably the best all-around fighter plane of WW II.

The fifth season focuses on the U-2 Dragon Lady, a secret Cold War spy plane with a troublesome crash record; the AV-8B Harrier, the vertical takeoff 'jump-jet' which changed the face of military air combat; and the KC-135 Stratotanker, the gigantic air tanker which travels the world refuelling jets in mid air, at speeds of over 550mph.

The sixth season focuses on nine aeroplanes that have changed the face of military flying forever.