"The flight itself was smooth, which is exactly what you want the first flight to be," said test pilot Evan Thomas, during a press briefing following the flight. "And for the most part, the airplane flew as predicted, which is again exactly what we want." While in the air, the aircraft reached a max speed of 175 miles per hour.
Last summer, Stratolaunch announced it was planning to develop a "family" of launch vehicles like this one, though it's since changed course as there were concerns that demand may not be high for its services. In January, the company laid off 50 employees.
In any case, three cheers to them for getting a metal bird the size of a city block into the sky.
h/t The Verge, The New York Times