The last test example of the Boeing 787-8, known as ZA004, completed its final flight on February 11, bringing to a close an almost sixteen-year mission that helped define the development and certification of the Boeing 787 Dreamliner program. The aircraft departed Boeing Field in Seattle for Pinal Airpark in Arizona, where it will enter long-term storage and partial reclamation.
ZA004 joined the flight-test program on February 24, 2010, under the registration N7874. Over 16 years, it performed more than 670 test flights, accumulating over 2,250 flight hours and visiting more than 30 airports worldwide. Among its key milestones was completing the 1,000th 787 program flight in 2011, as well as supporting certification of all Rolls-Royce engine variants for the Dreamliner, including the latest Trent 1000 XE in 2025.
In 2014, ZA004 also served as Boeing’s second ecoDemonstrator, acting as a flying testbed for more than 25 technologies aimed at improving efficiency and reducing emissions. It further played a critical role in validating upgrades to the aircraft’s power distribution system software following an in-flight electrical incident on an earlier test aircraft that temporarily paused the program.
The aircraft conducted its final test flight on February 3 and was welcomed back to its Seattle base with a traditional water cannon salute. For its last journey to Arizona, the original air-traffic control callsign “Boeing 004” was used once again, symbolically closing one of the most significant development chapters in modern widebody aviation.
Although it is leaving active service, ZA004 will not disappear entirely from the program. Certain components will be used for training and research, while others will be redistributed as spare parts through Boeing Global Services, continuing to support fleet productivity and operational reliability even in retirement.
The legacy of this test aircraft lives on in every Dreamliner flying today – and in those yet to be delivered. In an era where certification, efficiency, and sustainability define competitiveness, ZA004 remains a symbol of the phase in which ambitious engineering concepts were transformed into operational reality for global air transport.
