The Federal Aviation Administration has delayed certification of Boeing’s 737 MAX 10 until a software issue affecting automated flight guidance is resolved, adding uncertainty for the planemaker’s largest single-aisle jet. Boeing disclosed on Sept. 26 that the issue could prevent pilots from accessing automated flight guidance in a specific landing scenario, while the FAA said the software could increase pilot workload during a go-around. FAA Administrator Bryan Bedford said pilots retained control of the aircraft and distinguished the problem from the automatic flight-control failures associated with two 737 MAX crashes in 2018 and 2019. The agency plans to convene a Corrective Action Review Board, though sources said it is unlikely to meet before the following week. The review could require further rework before certification, which had been widely expected in October. Boeing is developing a permanent software update, while Bedford said GE Aerospace supplied the software and that a fix might be developed relatively quickly. Boeing shares closed down 6.9% as investors weighed the potential impact of another MAX 10 delay. WestJet said it has not experienced in-service issues or viewed the matter as a safety concern, while Alaska Airlines and United Airlines said their aircraft do not use the affected software. United is not accepting deliveries fitted with the version under review.