HistoryBoeing retires 787-8 test aircraft ZA004 after 15 years in flight program
Boeing has retired its 787-8 test aircraft known as ZA004 after more than 15 years supporting the Dreamliner flight-test and performance improvement programs.
The aircraft completed its final departure from Boeing Field and is being transferred to long-term storage at Pinal Airpark in Arizona, according to The Air Current. Boeing marked the retirement internally before preparing the jet for relocation.
ZA004 first flew on February 24, 2010, from Paine Field in Everett, Washington, as part of the 787 certification campaign. Although it was the fourth test aircraft built, it joined the flight-test program early to collect data needed for both certification and development work, including for the later 787-9 variant.
Captains Heather Ross and Craig Bomben, who conducted the aircraft’s maiden flight in 2010, were associated with the jet’s test career and are expected to operate the aircraft on its final flight to Arizona. Boeing has not disclosed any plans for the airframe beyond storage.
Originally assembled in 2008 for Northwest Airlines, ZA004 was intended for airline delivery. After Northwest merged with Delta Air Lines and amid delays in the 787 program, the aircraft was reassigned to Boeing’s flight-test fleet instead of entering commercial service.
During its service life, ZA004 was used for aerodynamics, high-speed performance, propulsion testing, flight loads, community noise evaluation and extended operations (ETOPS) assessments. In later years, the aircraft played a central role in testing upgrades to the Rolls-Royce Trent 1000 engine family.
More recent campaigns focused on durability enhancements under the Trent 1000 TEN and XE improvement initiatives, aimed at extending time on wing and reducing maintenance interruptions for operators. Certification work for these updates was supported by ZA004.
The retirement of ZA004 closes a chapter in the early development phase of the 787 program, which introduced advanced composite structures, new-generation engines and a more electric systems architecture to long-haul airline fleets.
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