Plane within plane tests jet interceptors

@article{1956PlaneWP,
  title={Plane within plane tests jet interceptors},
  author={},
  journal={Electrical Engineering},
  year={1956},
  volume={75},
  pages={666-668}
}
A cockpit installed in the main cabin of a T-29 airliner enables a back-seat pilot and 10 engineers to check new electronic control systems. Hughes Aircraft Company is flying a “plane within a plane,” readying new weapons of defense for operation months ahead of time, it was revealed at a press demonstration at the company's plant in Culver City, Calif.