The X–Planes X–1 to X–31

he X-Planes is the result of the author's life-long interest in what many consider to be the world's most exotic aircraft family. Encompassing everything from the rudimentary Bell X-1 supersonic research aircraft to the yet to be built X-31A designed for trans atmospheric flight at near orbital velocities, the book contains a detailed and authoritative accounting of every single x-designated aircraft ever built. Many documents were declassified specifically for use as references for this publication.