File:Nose of Boeing B-47 (WB-47E) with Boeing B-17 "Boeing Bee" in the background (7279847256) (2).jpg

From www.museumofflight.org/aircraft/boeing-wb-47e-stratojet

Boeing WB-47E Stratojet The B-47 Stratojet remains one of the most important aircraft ever designed by The Boeing Company. More than fifty years ago, the B-47 emerged as the world's first large multi-engine swept-wing airplane -- a design configuration that became the standard for all modern jetliners. In addition to its 35-degree swept wings, the B-47 featured pod-mounted engines and "bicycle" landing gear, which marked a daring departure from existing aircraft designs. In all, 2,042 B-47s were produced by Boeing, Lockheed, and Douglas. During the Cold War in the 1950s, the B-47 became the backbone of the Strategic Air Command's medium bomber fleet. Aside from its lasting contribution to aircraft design, the B-47 will be remembered as a primary deterrent to nuclear war at a time when that possibility was most threatening. After serving with SAC from 1953 to 1963, the Museum's Stratojet was redesignated as a WB-47 and flew weather reconnaissance missions with the U.S. Navy into the 1970s.