At separation, Falcon 9 first stage is doing about 2500 meters/second and is at about 70km altitude. The two connected 747s flying in formation don't get that f

At separation, Falcon 9 first stage is doing about 2500 meters/second and is at about 70km altitude. The two connected 747s flying in formation don't get that fast (or that high, but horizontal velocity is much more important).