# Boeing 777X by Boeing Canonical page: https://technooptimist.io/aviation/777x Frontier: [Aviation](https://technooptimist.io/aviation.md) · Field: Next-gen airliners · Company: [Boeing](https://technooptimist.io/companies/boeing.md) Stage: Pilot (3 of 5: Research → Proto → Pilot → Deploy → Scaling) Updated: last update 2026-09-01, facts checked 2026-10-11 Goal: Give airlines a twin-engine jet that carries 400-plus passengers on the longest routes while burning, Boeing claims, 20% less fuel per seat than the 777-300ER it replaces. Status: In final FAA certification: 7 test jets, 4,800+ test hours; first delivery targeted for 2027. Next milestone: 777-9 FAA type certification, target 2027 ## Milestones | Status | Milestone | Date | Slip | | --- | --- | --- | --- | | Done | Launched at Dubai Airshow with 259 orders and commitments | Nov 2013 | | | Done | 777-9 first flight | 25 Jan 2020 | | | Done | Test fleet grounded: cracked engine-to-airframe link | Aug 2024 | | | Done | Flight testing resumes with redesigned link | 16 Jan 2025 | | | Done | FAA approves TIA Phase 4B, the largest block of test flights | Jun 2026 | | | Done | Seventh test jet flies, dedicated to ETOPS testing | 29 Jul 2026 | | | Current | 777-9 FAA type certification | 2027 | | | Planned | First 777-9 delivery (Lufthansa expected first) | 2027 | +84 mo (originally 2020) | | Planned | Emirates' first 777-9 | Q2 2027 | | | Planned | 777-8 Freighter first delivery | 2028 | +12 mo (originally 2027) | ## Upcoming events - **2027**: 777-9 FAA type certification - **2027**: First 777-9 delivery (Lufthansa expected first) (slipped 84 mo) - **Q2 2027**: Emirates' first 777-9 - **2028**: 777-8 Freighter first delivery (slipped 12 mo) ## Most important updates - **Sep 2026**: Emirates' first 777-9 leaves final assembly in Everett ahead of painting. The first 777-9 for Emirates, the program's largest customer with 270 on order, rolled out of assembly in Everett in green primer. ([our story](https://technooptimist.io/stories/emirates-first-777-9-leaves-final-assembly-in-everett-ahead-of-painting-b3b29e00.md) · [original source](https://aviationa2z.com/index.php/2026/09/27/emirates-first-boeing-777-9-rolls-out-in-everett/)) - **29 Jul 2026**: Seventh 777-9 test jet makes its first flight and will mainly fly ETOPS certification tests. A seventh 777-9 flight-test aircraft flew for about three hours from Boeing Field in Seattle. ([our story](https://technooptimist.io/stories/seventh-777-9-test-jet-makes-its-first-flight-and-will-mainly-fly-etops-9e89d799.md) · [original source](https://aviationa2z.com/index.php/2026/07/30/boeing-777x-takes-off-for-final-certification-phase-ahead-of-2027-launch/)) - **Jun 2026**: FAA approves TIA Phase 4B, opening the largest remaining block of 777-9 certification flights. The FAA granted Type Inspection Authorization Phase 4B for the 777-9, letting FAA pilots and engineers join flight tests for the largest remaining part of the certification campaign. ([our story](https://technooptimist.io/stories/faa-approves-tia-phase-4b-opening-the-largest-remaining-block-of-777-9-8f76873e.md) · [original source](https://aviationa2z.com/index.php/2026/06/08/boeing-777x-clears-major-faa-milestone/)) - **29 Oct 2025**: Boeing delays first 777X delivery to 2027 and takes a $4.9 billion charge. Boeing pushed the first 777X delivery from 2026 to 2027 and booked a $4.9 billion charge in its third quarter. ([our story](https://technooptimist.io/stories/boeing-delays-first-777x-delivery-to-2027-and-takes-a-4-9-billion-charge-08a8b578.md) · [original source](https://www.clickondetroit.com/business/2025/10/29/boeing-pushes-777x-jet-deliveries-to-2027-amid-certification-delays/)) ## Current obstacles - **ETOPS testing on the critical path**: Long over-water approval needs its own campaign on a seventh test jet; Boeing's CEO said it runs into 2027 and most customers want it before delivery. - **Early-built jets need costly rework**: Emirates won't take about 10 early-build 777-9s, some from 2019, that need heavy changes to meet current standards; Boeing scrapped one unfinished airframe. - **Engine-mount structure**: Cracked links tying the engines to the airframe grounded the test fleet for five months in 2024; the redesigned part has to hold through the rest of testing. ## Physics limits - **A twin needs enormous engines**: A two-engine jet must still climb away on one engine after a failure at takeoff, so each engine is huge. Fan size is capped by ground clearance under the wing and by the weight and drag of the casing around it. - **Wingspan versus airport gates**: Longer wings cut drag, but airports fix how wide a plane can be on the ground. Folding tips buy span in the air, but the hinge's weight eats part of the gain: the net fuel saving is projected nearer 12-13% than 20%. ## How it works ### Composite wing: A longer, slimmer carbon-fibre wing Wing area grows from 437 to 517 m² and span to 71.8 m. A long, slender wing makes less drag for the same lift, the main lever on cruise fuel burn. ### Folding wingtips: Tips fold up at the gate The outer 3.5 m of each wing hinges upward on the ground, cutting span to 64.8 m so the jet fits the same gates and taxiways as today's 777. ### GE9X engines: The largest airliner engines built Each 3.35 m fan pushes a huge mass of air backwards fairly slowly, which wastes less energy than a small, fast jet. Rated about 110,000 lbf each. ### Certification: Proving it to the FAA phase by phase FAA pilots fly the test jets in approved phases (TIAs). ETOPS, approval for long twin-engine flights far from airports, comes last. ## Spec sheet | Spec | Boeing 777X | 777-300ER | Provenance | | --- | --- | --- | --- | | Seats (777-9, two-class) | ~426 | | reported | | Wingspan (tips folded) | 71.8 m (64.8 m) | | reported | | Wing area | 516.7 m² | 436.8 m² | reported | | GE9X thrust (each) | 110,000 lbf | | reported | | GE9X fan diameter | 3.35 m (132 in) | | reported | | Fuel per seat vs 777-300ER | -20% (Boeing claim) | | reported | | Orders (Nov 2025) | 619 from 12 customers | | reported | | Flight-test hours (Jul 2026) | 4,800+ on ~1,700 flights | | reported | | List price (2018) | $426M | | reported | Provenance: reported = stated by the company; estimated = our estimate; sample = a sample figure. ## About Boeing Boeing builds airliners, defence systems and spacecraft. In space it builds Starliner, a crew capsule for Space Station flights, and the core stage of NASA's SLS Moon rocket. - Builds Starliner, NASA's second crew capsule; on its 2024 crew test thrusters failed and the crew flew home on Dragon. - Next Starliner flight is cargo-only (Dec 2026 to Jan 2027); crewed flights are due to resume in 2028. - Builds the core stage of NASA's SLS rocket, which launched Artemis II in April 2026. - Founded: 1916 - Headquarters: US - Status: public - Listing: BA (NYSE) - Valuation: $172B (market cap, 2026-06) - Staff: ~172,000 - Website: https://www.boeing.com - People: Kelly Ortberg (CEO & President) - Partners, customers, investors: NASA (customer); Aerojet Rocketdyne (supplier) Company page: https://technooptimist.io/companies/boeing.md ## Related programs More from Boeing: - [Starliner](https://technooptimist.io/spaceflight/starliner.md) (Pilot) - [MQ-28 Ghost Bat](https://technooptimist.io/aviation/mq-28-ghost-bat.md) (Pilot) - [MQ-25A Stingray](https://technooptimist.io/aviation/mq-25a-stingray.md) (Pilot) - [Q4S quantum networking satellite](https://technooptimist.io/quantum/q4s.md) (Proto) - [F-47](https://technooptimist.io/aviation/f-47.md) (Proto) - [F/A-XX](https://technooptimist.io/aviation/f-a-xx.md) (Research) Everything in Aviation: https://technooptimist.io/aviation.md --- The Techno Optimist tracks every frontier of technology, program by program: https://technooptimist.io/ (a Markdown version of any page: add .md to its URL; site map for agents: https://technooptimist.io/llms.txt). 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