[kach22i]

/k/ Planes — /k/ Planes Episode 14.5: Mikoyan-Gurevich...

The MiG-105 was an orbital spaceplane similar in concept to the X-20 Dyna-Soar. The idea behind the aircraft was it would be attached to the back of an air-breathing mothership (designed by Tupolev), which would bring the aircraft up to Mach 6 at a very high altitude, and then the aircraft would detach and enter orbit under rocket propulsion.

Boeing X-20 Dyna-Soar
https://en.wikipedia.org/wiki/Boeing_X-20_Dyna-Soar

The Boeing X-20 Dyna-Soar ("Dynamic Soarer") was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including aerial reconnaissance, bombing, space rescue, satellite maintenance, and as a space interceptor to sabotage enemy satellites.[1] The program ran from October 24, 1957 to December 10, 1963, cost US$660 million ($5.16 billion today[2]), and was cancelled just after spacecraft construction had begun.