There are a lot of people who just hang out around Palmdale waiting for something to happen, and this morning they saw the first known flight of a B-21. Not sure about the white color, but it might not have its stealth coating yet. It's got a smaller jet as an escort, but I can't tell what it is.
US Air Force's new B-21 Raider "flying wing" bomber takes first flight - Reuters witness
The U.S. Air Force's B-21 "Raider" bomber shaped like a flying wing took its first flight on Friday, the next step in rolling out a new fleet of long-range nuclear-capable stealth bombers built by Northrop Grumman , according to a Reuters witness.
www.reuters.com