Lockheed SR-71 Blackbird SR-71C

The SR-71C was a one-off, built to replace the SR-71B trainer lost in January 1968. The airframe, the thirty-second and last of the series, was assembled in 1969 by joining the aft section of the first YF-12A (serial 60-6934), damaged in a 1966 landing accident, to the forward fuselage of an SR-71 static test article, to which an instructor's station was added.

Its origin earned it the nickname "The Bastard" and also a reputation for flying crooked: it was said to yaw at supersonic speed. The explanation turned out to be less dramatic than the legend — a misaligned pitot tube reported a 4° yaw that was not actually there — and once corrected the aircraft flew normally.

Being the only aircraft of its designation, its history is the history of a single tail number. It is preserved at the Hill Aerospace Museum, Hill Air Force Base, Ogden, Utah. Note that part of the secondary literature attributes to it 64-series serial numbers that are not its own.