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from “Nuclear-powered aircraft” (“Применение атомных двигателей в авиации”), published in 1957, by G. Nesterenko, A. Sobolev, and Yu. Sushkov. Fig. 53: “Train” of nuclear strato-planes (from “Tekhnika-Molodezhi” magazine, Vol. 1, 1935.). Nuclear-powered strato-planes should consist of two planes. First one contains nuclear engines. Second one... - http://silpol.tumblr.com/post/30948772652
They even had a flying prototype. Too leaky for real operation, though. ICBMs obviated it. ‎- 9000