What is the name of the world’s largest plane wingspan that took first flight on 16th April 2019 for California?

Stratolaunch Roc is the world's largest plane manufactured by Scaled Composites.
The length of this plane is 238 feet.
The tail height of this plane is 50 feet.
The wingspan of this plane is 385 feet.
The top speed of this plane is 304 Km/h.