In 1964, based on the MiG-21s began the development of analogue aircraft A-144, aerodynamic design of the wing which repeats the shape of the bearing surface of the supersonic passenger airliner TU-144.
Aleksandr Markin
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/33104187@N04/9678535680/">Aircraft Mig-21I under the wing of the plane Tu-144</a>