Boeing 777X

Boeing announced the 777X in November 2013 as an evolution of the 777-300ER, retaining its twin-aisle cross-section while introducing a new composite wing with folding tips (the first such feature on a commercial airliner) alongside the new GE9X turbofan. The programme attracted more than 300 orders on its launch day, the largest in Boeing wide-body history.

The 777-9 prototype completed its maiden flight on 25 January 2020, but a series of certification challenges (including engine compressor issues, a pressurisation problem detected during testing, and a cracked thrust link discovered in 2024) have repeatedly delayed entry into service. As of early 2026, the aircraft remains in FAA flight-test certification, with Boeing targeting certification later in 2026 and first delivery to launch customer Lufthansa in 2027. The stretched 777-9 is expected to seat around 426 in a standard three-class configuration once configurations are finalised, while the shorter 777-8 is being optimised for ultra-long-range routes.

Not yet available. The Boeing 777X retains the wide 777 fuselage cross-section (roughly 6.2 m interior width), which is expected to allow a nine-abreast economy layout consistent with earlier 777 variants. However, as no aircraft has entered service, no airline has published a certified seat count, pitch, or class configuration. Once Lufthansa or another launch operator confirms its cabin

The dimensions and weights below are for the 777-9 baseline; the 777-8 is approximately 6 m shorter with a longer range.

The 777X’s combination of composite wing and GE9X engines is expected to deliver roughly 12% better fuel efficiency per seat than the 777-300ER it succeeds, once in service.

The Boeing 777X is exclusively powered by the General Electric GE9X-105B1A, the world’s largest commercial turbofan at 3.4 m in diameter. Each engine delivers approximately 105,000 lbf of thrust. Key improvements over the GE90 predecessor include a carbon-fibre composite fan, a ceramic matrix composite (CMC) hot section, and a refined combustion system that reduces NOx emissions.

Not yet confirmed. As the Boeing 777X has not entered service, no airline has published finalised in-seat amenity specifications. Based on industry expectations for new-build aircraft, connectivity and entertainment features are likely to include Wi-Fi, USB power, and seatback entertainment — but these should be treated as anticipated, not confirmed, until launch operators publish their cabin details.

Boeing assembles the 777X at its Everett facility in Washington, alongside the 777 and 787 families.

No 777X aircraft have been delivered as of early 2026. The test fleet numbers five aircraft, including Lufthansa’s first production-standard airframe. Emirates holds the largest single order. For ongoing programme updates, see Dj’s Aviation’s airline coverage.

No hull-loss events have been recorded, as the 777X has not yet entered commercial service. The certification journey to date has included: