This would be an incredible engineering feat. I think there is still a stage and some parts that aren't reused on a Falcon 9 rocket. Also some said re-usability

This would be an incredible engineering feat. I think there is still a stage and some parts that aren't reused on a Falcon 9 rocket. Also some said re-usability of parts is less economically important than assumed, it is only worthwhile if you do a lot of starts. But to have a plane reach space and establish orbit would be awesome. Many said it would not be possible with the gravity and atmosphere of Earth.