Boeing’s 777X Range Jumps Overnight — And the Company Isn’t Talking

Boeing quietly boosted the 777X’s advertised range by more than 700 nautical miles per variant, with no announcement, as Airbus flight-tests a longer-range rival and certification slips toward a seventh year of delay.

Boeing has quietly increased the advertised range of its 777X jetliner by more than 700 nautical miles for both variants, without issuing any public explanation, archived web pages show.

The change was first flagged by a Reddit user who compared Boeing’s current website with Wayback Machine archives, and reported Tuesday by the aviation outlet Simple Flying. As recently as June 17, Boeing’s website listed the 777-8 at 8,745 nautical miles and the 777-9 at 7,285 nautical miles. Sometime in the following three weeks, those figures rose to 9,500 nautical miles for the 777-8 and 8,000 for the 777-9 — increases of 755 and 715 nautical miles, or roughly 9% and 10%, respectively.

Boeing did not respond to Simple Flying’s request for comment, and the company has not issued a press release, statement or regulatory filing addressing the change. Boeing also has not said whether an engineering modification prompted the new figures or whether the company simply revised its performance estimates.

The update lands at a pointed moment for Boeing’s twin-engine flagship. Range is one of the most closely watched specifications for any widebody jet, since it determines which nonstop routes an airline can fly and how it stacks up against rival aircraft. The new 777-8 figure narrows, though does not close, the gap with the Airbus A350-1000ULR, an ultra-long-range variant Airbus advertises at nearly 10,000 nautical miles and which completed its first test flight June 2 from Toulouse Blagnac Airport in France. The two companies’ updates arrived within the same news cycle, intensifying scrutiny of both jets’ capabilities.

Two-class seating capacity also shifted in Boeing’s updated specifications. The 777-8 moved from a single figure of 395 passengers to a range of 350 to 425, while the 777-9 moved from 426 to a range of 375 to 450, according to Boeing’s website.

Closing the Gap With Airbus

The revised 777-8 range trails the A350-1000ULR by roughly 500 nautical miles. Airbus achieved its jet’s extended range by adding a rear center fuel tank, a modification the company said was “made possible primarily by the integration into the aircraft structure of an additional rear centre tank.” The A350-1000ULR now under flight test is the first of 12 aircraft ordered by Qantas Airways for its Project Sunrise service, with deliveries expected to begin in April 2027 and nonstop flights between Australia and Europe and North America to follow.

Boeing’s twin variants share an identical folding wingtip design, with a wingspan of 71.8 meters in flight that narrows to 64.8 meters on the ground — matching the footprint of the older 777-200LR and 777-300ER and allowing the larger jet to use existing airport gates. Both variants are powered by GE Aerospace’s GE9X engines, certified at up to 110,000 pounds of thrust. The updated 777-8 range now outpaces the 777-200LR’s 8,555 nautical miles by about 945 nautical miles, while the 777-9 exceeds the 777-300ER’s 7,370 nautical miles by roughly 630.

Certification Still Pending

The range update comes as Boeing works through a certification process that has run years behind schedule. The company launched the 777X program in 2013 and once targeted 2020 for entry into service; first deliveries are now expected in 2027, about seven years later than planned. Boeing recorded a $4.9 billion pretax charge on the program in October 2025 alone, and cumulative 777X charges have topped $15 billion.

Boeing Chief Executive Kelly Ortberg said in May at the Bernstein Strategic Decisions Conference that the 777X certification flight test program was expected to be “completed by the end of the year,” pointing to certification itself following in 2027. The company received Federal Aviation Administration authorization the following month for a testing phase known as TIA Phase 4B. Stephanie Pope, president and CEO of Boeing Commercial Airplanes, told Leeham News the authorization “unlocks the largest remaining portion of our flight test with the FAA that we can now go execute,” adding that it enables further avionics, stability and control, and human factors testing.

Lufthansa’s first production-standard 777-9 completed its maiden flight May 8 from Paine Field in Everett, where Boeing’s commercial airplanes division and all 777X production is based. Lufthansa remains the launch customer for the jet. Roughly 30 early-built 777-9s, built between 2020 and 2024 to a pre-certification standard, remain in storage at Paine Field and require modification before they can be delivered; Boeing plans to begin deliveries instead with new-production aircraft.

No major U.S. airline has placed a firm order for the 777X, and its customer base is concentrated among Middle Eastern and European carriers. Emirates holds the largest order, at 270 aircraft across both variants, followed by Qatar Airways at about 94 and Lufthansa at 27 (20 passenger 777-9s and seven 777-8 freighters). Total firm orders topped 540 aircraft as of mid-2025. Ortberg told a Morgan Stanley investor conference in September 2025 that certification represented a “mountain of work” for the company.