English: The NAC-60 was North American Aviation's entry into the US Supersonic Transport program. It was essentially a modified version of their B-70 Valkyrie bomber design and retains a number of features from that aircraft, notably the high-mounted canard behind the cockpit area, and details of the engine area under the rear fuselage. This image is a model found at the Delta Flight Museum, who have graciously released this image under the CC-by-SA.