An un-tethered flight test by Armadillo Aerospace and NASA be successfully completed reachin' a height o' 180 feet. Blimey! T' altitude isnt t' important part, though. Federal Aviation Administration regulations controlled t' altitude, but t' flight experience gained includin' all phases o' t' check-out, shiver me timbers, ground loading, flight, and recovery operations is identical regardless o' altitude.