After more than a decade since Boeing began taking orders for its 777X, the aircraft’s delivery remains delayed. Initially scheduled for commercial service in 2020, the jet is now expected to enter service in 2027. Regulatory approval is still pending, and uncertainty surrounds when the aircraft will be certified and delivered.
The Boeing 777X was developed as a new generation of twin-engine aircraft aimed at improving fuel efficiency and operational economics for airlines. The family includes three variants powered by GE9X engines: two passenger models (the 777-8 and 777-9) and a freighter version. These jets incorporate technology from the 787 Dreamliner, aiming to reduce fuel consumption by about 20% compared to earlier models and lower operating costs.
Boeing intended for the 777X to compete with Airbus’ A350. While the A350-1000 has a longer range, it falls short on capacity compared to the larger variant of the Boeing model.
Delays have affected the program due to several factors. One reason has been internal challenges at Boeing, both with this project and other aircraft programs such as incidents related to different models. Regulatory delays are also significant, often linked to these same issues. The COVID-19 pandemic added further complications by disrupting supply chains across aviation manufacturing, reducing Boeing’s deliveries from over 800 planes in 2018 down to just over 150 in 2020.
Boeing has faced increased regulatory scrutiny after multiple accidents involving its planes in recent years, including a door plug failure on an Alaska Airlines flight in January 2024 and earlier crashes that led to global groundings of certain models. For the 777X specifically, issues like an “uncommanded pitch event” during testing have slowed progress through certification phases with authorities such as the Federal Aviation Administration (FAA). The FAA started phase three of its Type Inspection Authorization late last year; any new technical concerns can prolong this process.
The FAA recently announced efforts to modernize its certification process by reducing exemptions and special conditions required for new products. According to their statement: “This would reduce certification costs and time to certify new and changed products.”
Technical problems have continued throughout development of the aircraft:
– In 2019, structural failures were found during high-pressure tests.
– Engine compressor problems caused delays before first flight.
– Uncommanded pitch events occurred during test flights between 2020–2021.
– Certification was postponed due to unresolved technical issues.
– Additional engine faults grounded test fleets again in subsequent years.
– Cracks discovered in engine thrust links resulted in further groundings.
– Most recently, durability concerns regarding engine seals were identified.
Chief executive Kelly Ortberg stated earlier this year that despite ongoing issues with engine seal durability, “the schedule remained unchanged” and that flight testing continues. An engine developer spokesperson supported this view but provided few details about recent findings.
Despite setbacks, production under the program continues so that deliveries can begin quickly once approval is granted. As of last year, at least 26 units had rolled off production lines at Paine Field near Seattle according to reports from The Seattle Times; satellite images indicate even more airframes may be parked at or near the facility.
Firm orders totaled around 560 variants by late last year. With persistent supply chain bottlenecks industry-wide since the pandemic began, Boeing’s decision to produce ahead could help limit additional delays once final clearance arrives.
As of September last year CEO Ortberg described “a mountain of work” remaining before deliveries can begin; compensation owed for missed deadlines reportedly neared $15 billion by October when delivery was pushed back another year. Whether Boeing meets its revised target depends on passing regulatory hurdles—an outcome not guaranteed given past challenges—but preparation continues as airlines await their long-promised jets.
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