5th Boeing 777X Begins Testing After 4,000 Hours of Flight Trials for Certification

In a major milestone for the 777X program, Boeing’s fifth 777-9 test aircraft took off from Paine Field in Everett, Washington, on August 5 at 11:03 a.m. PDT. This event marks the first 777-9 built, prepared, and flown by the team in nearly five years—a strong indicator of progress toward certification and eventual entry into commercial service.

Flight Highlights

Capt. Ted Grady, Boeing’s 777X chief pilot, and Capt. Mark Brown, the 777-9 project pilot, led the aircraft through a 2-hour and 27-minute flight to evaluate its handling and performance. The flight path covered a region over Washington state, achieving an altitude of 39,000 feet (11,887 meters) and a cruising speed of Mach 0.84 (511 knots)—a standard profile for initial test flights.

They were supported on board by systems operators Zach Lewis and Joel Conard, along with flight analysts Cody Bruinsma and Mike Deutsch. The aircraft returned safely to Paine Field at 1:30 p.m. PDT.

“The 777-9 flies beautifully and performed exactly as expected,” said Capt. Grady. “This achievement is a result of the incredible efforts by our teams who designed, built, and prepared the aircraft. We remain focused on achieving certification and delivering this aircraft to our customers.”

Pre-Flight Preparation

Since its factory rollout last month, the aircraft has undergone extensive preparation, including fueling, engine runs, and taxi testing. As the engineering ship captain, Michael Kellner coordinated efforts across engineering disciplines to support the production team in getting the airplane flight-ready.

“We treat these airplanes like our own children,” said Kellner, a Boeing veteran of over 16 years. “Watching it take flight fills us with pride and excitement. This is a big step toward delivery.”

What’s Next

The newly flown 777-9—configured to production standards—will now enter a planned phase of ground and flight testing. This includes validation of its resilience to electromagnetic interference and lightning strikes.

To date, the 777-9 test fleet has logged over 4,000 hours of flight testing, undergoing rigorous assessments to demonstrate the safety and reliability of the aircraft’s design.

Boeing aims to deliver the first 777-9 in 2026.

About the 777X Family

The Boeing 777X family consists of the 777-9, the 777-8 passenger variant, and the 777-8 Freighter. Representing the latest generation of Boeing’s widebody aircraft, the 777X series has already secured over 550 orders from global customers.

Also, Singapore Airlines (SQ) is getting ready to welcome the long-awaited Boeing 777X, as the aircraft has finally resumed its test flights after nearly five years. The test flights recently took off from Boeing’s Everett facility near Seattle, bringing fresh momentum to the program.

This renewed activity is a big step forward in the Boeing 777X’s journey toward certification. The US Federal Aviation Administration (FAA) has now approved Boeing to move into the next phase of testing. This progress suggests that the 777X could finally enter commercial service by mid-2026.

With Singapore Airlines being one of the key launch customers, the 777X is expected to bring enhanced performance, fuel efficiency, and passenger comfort to its long-haul fleet.

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