The Boeing 777X takes off from Everett, Wash., on Saturday.

SEATTLE, Wash. — “The 777X flew beautifully,” said Capt. Van Chaney after successfully flying Boeing’s newest aircraft Saturday.

“Thank you to all the teams who made today possible. I can’t wait to go fly your airplane again,” added the chief pilot for 777X test and evaluation

With that first flight, the world’s longest and largest twin-engine airliner entered the next phase of its test program.

The 777-9X is based on the popular 777.

The aircraft took off in front of thousands at Paine Field in Everett, Wash., at 10:09 a.m. local time for a three-hour, 51-minute flight over Washington state before landing at Seattle’s Boeing Field, the company said.

Chaney called the flight very productive.

The first of four dedicated 777-9 flight test airplanes, WH001 will now undergo checks before resuming testing in the coming days, Boeing said.

“Our Boeing team has taken the most successful twin-aisle jet of all time and made it even more efficient, more capable and more comfortable for all,” said Stan Deal, president and CEO of Boeing Commercial Airplanes.

“Today’s safe first flight of the 777X is a tribute to the years of hard work and dedication from our teammates, our suppliers and our community partners in Washington state and across the globe.”

Boeing has won 340 orders and commitments for the 777X from leading carriers, including Emirates, Lufthansa and Singapore Airlines.

The first delivery is expected in 2021.

Images are courtesy of Boeing.