Boeing says its 737-10 development team completed the aircraft’s final planned certification flight test on July 28, 2026, marking the end of the flight test portion of the certification effort and shifting the programme into “closeout” work and regulatory submissions. What “final planned certification flight” actually meansFinishing the final planned certification flight does not mean the aircraft is already certified. It means Boeing believes it has completed the planned flight-test data collection needed for certification and now needs to finish the remaining internal and regulatory steps. Boeing notes the final certification flight itself was an interiors evaluation focused on confirming the audibility of the lavatory smoke detector and the cabin speaker system to ensure crews can detect and respond to onboard alerts. The test fleetBoeing test pilot Dan Mangel said he flew the first flight of that specific test aeroplane four years earlier and called the final certification test flight “a bit of an emotional day”.