B-36 although they pretty much don't exist anymore. Magnesium and aluminum airframe, six Pratt & Whitney 4360s Wasp Major 28 cylinder radial engines, four GE J47 jet engines, and it could carry the 42,000 lb MK17 10 to 15 megaton hydrogen bomb (the largest nuclear weapon in the US aresenal).
At takeoff the pilots would say, "Six churning, four burning, and one glowing..."