The 777-9 flight test airplane leaves Paine Field, in Everett, Wash.

Craig Larsen photo

Boeing on Sunday began flying WH004, the fourth 777-9 flight test airplane, completing the dedicated flight test fleet. Captains Ted Grady and Richard Johnson, joined by Scott Brihn, Kinsey Bilyeu, Brock Welge, and Mike Deutsch, left Paine Field in Everett, Wash., for a 2-hour, 46-minute flight before joining WH001, WH002 and WH003 at Seattle’s Boeing Field.

WH004 will test environmental control systems, extended operations and more as part of Boeing’s robust test program. “More than just a milestone, this a testament to the teams that made it happen,” said Josh Binder, VP/GM, 777X program. “I’d especially like to thank our factory, field and test teams, who are focused and committed every day to delivering a safe and successful airplane.”

Julie O’Donnell