The airplane must receive crucial ETOPS certification.

Boeing's flagship aircraft is now around seven years behind schedule.

Add Yahoo as a preferred source to see more of our stories on Google. I toured an experimental Boeing 777X aircraft, which the planemaker is using to certify the new $442 million widebody. See inside.

Boeing said it grounded its fleet of four 777X test fleet after finding damage in one of the jetliner's structures. It wasn't immediately clear whether the problem will delay deliveries of the new ...

Boeing has reactivated its fourth 777X testbed aircraft, WH004, marking the first time all four test airplanes are concurrently active since 2021. WH004 is uniquely configured with a full passenger ...

SEATTLE (Reuters) - Boeing resumed testing for its long-delayed 777X widebody jet on Thursday, with the first flight since the U.S. planemaker grounded the test fleet in August due to the failure of a ...

Boeing has suspended certification flight testing of its 777X airliner after discovering problems with the engine attachment structures in all three test aircraft. A thrust link, a component securing ...

Boeing received Federal Aviation Administration approval to begin Type Inspection Authorization Phase 4B certification flight testing for the 777X. The authorization marks a key step in the long ...

“During final load testing on the 777X static test airplane, the team encountered an issue that required suspension of the test,” Boeing spokesman Paul Bergman said in a statement, according to ...

Boeing said it is pausing test flights of its still-in-development 777X fleet after technicians discovered a structural issue during a post-flight inspection. “During scheduled maintenance, we ...

Boeing said Monday that it has grounded its fleet of 777X test aircraft for inspections following discovery over the weekend of a failed component connected to the jet’s engine. After one of the 777X ...