got to 9.400 with jet engines, unfortunately I was a microsecond late hitting the screen capture button EDIT: second parabola: 10.400 I also reached 10.400 with a rocket assisted take-off, but this way was more fun 8) ok, increased to 10.750 meters, the three altitudes were done on the same launch, I don\'t think that more that this altitude can be reached with only two jets, as having an altitude a little higher than 8.000 meters makes the airflow to decrease.