Six years late and $15 billion deeper in the red, Boeing’s 777-9 program just revealed another layer of complexity: roughly 30 already-built aircraft need significant modifications before delivery. The Boeing 777-9 has tested institutional patience on a scale that few programs have matched. The 1Q26 earnings call added a new data point: roughly 30 already-built 777-9s require modifications before they can be delivered to customers. The headlines called it surgery. The reality is more nuanced — and more instructive about how Boeing is actually managing this program. What "Change Incorp" Actually Means CEO Kelly Ortberg was direct: "We've got roughly thirty 777s that'll go through this change incorp process over several years." The work involves updating aircraft built years ago with design changes introduced during flight testing and certification, as well as production improvements. This is not a safety recall. It is not a design failure. It is the predictable consequence of building aircraft early — before the design is fully locked in — in order to capture manufacturing learning and build production knowledge ahead of certification. Boeing made a deliberate choice to build inventory while testing continued. That inventory now requires updates to meet the final certified standard. Boeing did the same thing with the MAX; it kept its supply chain working as long as it could after the grounding. Doing so is a risk and a tradeoff between production stability (keeping those crucially important skilled people busy) and potential certification changes. Boeing has placed this bet twice now and lost both times. Ortberg called the process a "pretty massive activity" and noted the scope varies significantly by airframe age — older aircraft require more extensive structural modifications, while recently built jets need minor upgrades. A dedicated team has been formed to manage the work, with Boeing planning to bring all affected aircraft to a common configuration level before applying final changes — what Ortberg described as the most efficient path forward. The memory of the ghost MAX factory has hardly faded, and here we are again. The GE9X Engine Complication Running concurrently: GE Aerospace identified the root cause of a mid-seal durability issue in the GE9X engine — discovered during a shop visit in January 2026, when a crack was found in a critical component that balances temperature and pressure within the engine core. GE has finalized a redesign and is now ramping supplier production for the updated component. The GE9X exclusively powers the 777-9. Until the engine fix is incorporated, delivery-ready aircraft need delivery-ready engines. The Certification Clock The 777-9 certification program has advanced to TIA Phase 4A, which the FAA approved on March 17. This phase focuses on natural icing tests, and Boeing prioritized completing this work while suitable icing conditions remained available in Alaska — a seasonal window that, if missed, causes its own delay. Phase 4B, expected imminently, represents a significantly larger block of tests. Together, 4A and 4B account for roughly the same testing volume as Phase 3, which began in November 2025. Boeing has accumulated more than 4,000 hours of 777-9 flight testing across four dedicated test aircraft. The program is deep into certification — not approaching it. Does It Threaten 2027 Deliveries? The honest answer is: perhaps not yet, but margins are narrow. Boeing confirmed the rework is not expected to delay the first delivery, and the 2027 target with Lufthansa remains the stated plan. Ortberg's framing — change incorporation over several years — suggests the 30 aircraft will not all be reworked before the first delivery. The Lufthansa aircraft, presumably among the most recently built and requiring the least modification, is likely to be prioritized. What threatens 2027 is not the rework alone — it is the combination: 30 aircraft needing modification, a GE9X engine fix still being incorporated into supplier production, Phase 4B testing still ahead, and a program that has already absorbed $15 billion in charges. Each element is manageable individually. Together, they leave no room for unknown unknowns. Emirates, the biggest 777-9 customer, expressed dissatisfaction long ago. Sir Tim Clark no doubt has stronger words now. Bottom Line The 777-9 rework story is real; the scope is significant, and Ortberg's own word—"massive"—demands attention. But the framing matters. This is a program catching up on accumulated design changes, not discovering new problems. The certification path is defined. The 2027 delivery target stands. What next year represents is already a seven-year delay from the original 2020 entry into service. The carriers waiting on the 777-9 are not celebrating. They are watching Phase 4B.
