
Boeing has formally reactivated one of its test 777X jets after it spent 3 years and 4 months on the ground.
Cited by @b777xlovers on X (formerly Twitter), the test aircraft was first produced 4.6 years ago and formed an integral part of the initial work towards certification.
However, the aircraft, registered as N779XZ, completed its last flight three years ago on Thursday, 18 November 2021, between Seattle and Everett.
Following this flight, the aircraft has been parked and not airborne, but that is expected to change as the aircraft destined for Luthansa is scheduled to begin test flights sooner rather than later.
The reactivation of this unit aligns with a necessary period for the American planemaker as they continue to push towards achieving certification on this upcoming long-haul jet by 2026.
Boeing’s Most Recent Delay
Boeing was forced to publicly delay the 777X’s launch from 2025 to 2026 after internal realisations that progress was not moving in the right direction.
The delay frustrated airline customers, who also had to postpone their expectations for when the plane would be delivered. Some even doubted whether the manufacturer could stick to current schedules.
Emirates forecasts the first delivery of the 777X sometime in 2027 and hasn’t been afraid to publicly say that if this isn’t possible, a 2028 delivery timeframe would be more likely, three years later than Boeing’s most recent estimate and eight years after what was initially scheduled.

Boeing has not been aided by the 2024 confirmation that test flights would be paused after a structural part mounted to a GE9X on the aircraft was said to have failed and, thus, not be in satisfactory working order.
A halt was required for the program to examine the other active test units, not the first suspension in the certification period. Therefore, it was a challenge internally for the planemaker to work through.
The Boeing 777X In 2025
In 2025, Boeing continues to work through certification with positive developments in late March.
A positive step was taken in the certification process as the American planemaker said it had officially begun key certification of the braking system for its upcoming 777X.
The first reports of brake testing emerged in the second week of March when WH001 or N779XW arrived at Clinton Sherman Airport (CSM) in Oklahoma on March 11, 2025.

After touching down, the plane’s performance under braking commenced, with various conditions required to ensure the plane’s safety and reliability.
Suppose the Federal Aviation Administration (FAA) can deem the brakes reliable. In that case, it will represent another important step in the ongoing certification process of what has become one of the more scrutinised commercial airliners.
Boeing must navigate 2025 smoothly and avoid further hiccups in the testing process, as delays can compound and cause the program further harm.

ABOUT THE AUTHOR
Daniel Fowkes is a Melbourne-based aviation analyst and journalist with over a decade of industry experience. As founder of Dj’s Aviation, he delivers trusted analysis on aircraft, airline strategy and global aviation trends for djsaviation.net
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