You're describing rockoons [1], which were used for launching (non-orbital) sounding rockets back in the 1950s. I think they fell out of use as high altitude j

You're describing rockoons [1], which were used for launching (non-orbital) sounding rockets back in the 1950s. I think they fell out of use as high altitude jet aircraft became more common and economical as a launch platform. [1] https://en.wikipedia.org/wiki/Rockoon https://en.wikipedia.org/wiki/Rockoon