Boeing gets FAA green light for major 777-9 test phase, a step toward the long-delayed 777X certification push

Boeing’s 777-9, the first variant in its long-delayed 777X widebody program, cleared a significant regulatory hurdle this week as the company moved deeper into its FAA certification campaign. Boeing Commercial Airplanes CEO Stephanie Pope said the U.S. Federal Aviation Administration has authorized Boeing to begin Type Inspection Authorization (TIA) Phase 4B testing on the aircraft, describing it as the largest remaining portion of FAA-supervised flight work. The milestone was discussed around June 6 at the IATA Annual General Meeting in Rio de Janeiro, according to multiple industry reports.

TIA is the FAA’s staged framework for supervised certification testing on new aircraft. In practical terms, it is the point where FAA personnel participate directly in validating that the airplane’s safety cases, checklists, and operating behavior meet regulatory requirements, while specific areas of the airplane are evaluated more intensely at each phase. In Pope’s account, earlier TIA steps were smaller pieces of the work, while Phase 4B represents a much larger remaining block focused on core systems and operational handling.

In industry interviews, Pope said TIA Phase 4B is “significantly larger” than the earlier 4A authorization and is concentrated on systems such as avionics, stability and control, and human-factors related flight testing. Aviation Week reported that Pope described the authorization as enabling the next tranche of FAA-coordinated tests and as a major “confidence booster” as Boeing works toward completing flight testing and ultimately earning certification.

The timing matters for Boeing because it has been trying to preserve delivery momentum after years of schedule slippage. Boeing has continued to point to 2027 as its first-delivery target for the 777X program. In its April earnings release, the company said the 777X program was making progress on certification, including FAA approval to enter TIA 4A, and that it still anticipates first delivery in 2027.

Industry reporting also indicates that Phase 4B is not the end of the FAA-supervised journey. A key remaining element is extended-range twin-engine operations, or ETOPS, which is required for long-range flights over oceans and other remote regions. Aviation Week quoted Boeing’s leadership describing ETOPS as the major remaining approval step after the core flight-test program, and Air Data News said regulators still point to certification extending into 2027 rather than landing strictly by the end of 2026.

Market context is also shaped by the scale of the commercial order book for the 777-9 and the company’s need to restart a credible “build-to-deliver” rhythm. Air Data News reported 541 firm orders for the 777-9, along with additional orders for the 777-8 and 777-8 Freighter. While that does not guarantee near-term cash flow, it raises the stakes of finishing certification tests in a way that avoids additional delays.

What remains unclear is the exact duration of the new Phase 4B testing and how quickly Boeing can translate that approval into type certification. The FAA authorization itself indicates progress, but none of the accessible reporting here provides a detailed timetable of the specific test flights still planned, nor any confirmed decision date for certification. Boeing also did not publicly attach a new delivery schedule to this particular milestone in the materials reviewed, so investors are likely to keep watching for follow-on disclosures on ETOPS timing and any remaining outstanding items before certification and the next delivery starts.