Stratolaunch conducted the test from the Mojave Air and Space Port in Mojave, California.
After cancelling a flight on April 24 due to unfavourable weather, the test took place today.
Once the plane was airborne, the Roc performed various flight test maneuvers.
“Touchdown!” Stratolaunch tweeted as the aircraft landed.
“Successful flight tests to round out the day. What a beautiful sight”.
The 117-metre wingspan aircraft flew for three hours and 14 minutes over the Mojave Desert and reached an altitude of 4267.2 metres.
As part of this latest flight, pilots further prepared the carrier aircraft to support launches of its upcoming hypersonic testbed vehicle, Talon-A.
Talon-A is a fully reusable, autonomous, liquid rocket-powered Mach 6-class hypersonic vehicle.
“We’re focused on safely and securely releasing operational hypersonic vehicles from our carrier aircraft,” Stratolaunch chief operating officer Dr Zachary Krevor said.
“The test flight today provided valuable insights and data to help us continue this journey.”
Stratolaunch is working to advance high-speed technology through design, manufacturing, and operation of aerospace vehicles.