Boeing has reached a significant milestone in the protracted certification campaign for its largest 737 MAX variant, with the aircraft now engaged in the second phase of FAA flight testing. The move into Type Inspection Authorization Phase 2, which began in the first quarter of 2026, signals growing confidence from regulators. Yet for the engineering teams, the real work is only intensifying as they tackle the exhaustive documentation required to prove the jet's robustness in every imaginable scenario.
At the core of remaining tasks are 31 System Safety Assessments that Boeing must submit for approval. These analyses go far beyond flight test data, requiring engineers to model every potential system failure across hydraulics, engines, flight controls and brakes. Each assessment can generate documentation running to thousands or even 15,000 pages, probing questions such as component reliability, the cascading effects of single failures, and how flight crews might respond to erroneous data. Boeing engineers have described the need to evaluate situations so remote they might occur once in a billion flight hours.
This level of scrutiny is a direct legacy of the two fatal 737 MAX 8 accidents in 2018 and 2019 that claimed 346 lives and led to a 20-month global grounding. In response, Boeing committed to overhauling its safety processes, including developing entirely new analyses from scratch for systems such as the Stall Management Yaw Damper. The FAA has maintained close oversight, and Administrator Bryan Bedford stated in April 2026 that no obstacles have been identified that would prevent certification of both the MAX 10 and shorter-fuselage MAX 7 by the end of the year.
The commercial demand for the stretched narrowbody has never wavered despite the delays. As of early 2026, the type held more than 1,400 firm orders according to fleet data providers, far outpacing the MAX 7. Major customers each holding over 100 units include United Airlines, Ryanair, Delta Air Lines, Alaska Airlines and American Airlines. Panama's Copa Airlines recently added more MAX-family aircraft while retaining flexibility on final variant selection. The MAX 10 offers operators a close match in capacity to several Airbus A321 models, although its range falls short of the long-range A321XLR.
Originally planned for service entry in 2020, the program has been repeatedly pushed back by certification requirements, the COVID-19 pandemic and additional regulatory reviews of systems such as crew alerting and angle-of-attack protection. Boeing executives have pointed to maturing assessments and the "light at the end of the tunnel," while customers have adjusted expectations, with several now forecasting initial aircraft arrivals in 2027.
The behind-the-scenes effort underscores the manufacturer's determination to restore confidence after past scrutiny. Every theoretical hazard must be addressed and mitigated to the satisfaction of the FAA and international partners. While visible test flights capture attention, it is this meticulous engineering documentation that will ultimately allow the 737 MAX 10 to join airline fleets and help Boeing address its narrowbody backlog.
Industry observers note the disparity in order volumes highlights strong market appetite for the largest MAX family member as airlines seek efficiency gains on domestic and short-haul international routes. With production rates increasing and wiring issues on current MAX jets being resolved, successful certification would represent a major step forward for Boeing's commercial aircraft business.