Boeing has identified a software glitch on some 737 MAX aircraft that can disable an automated navigation function during landing after a missed approach. The problem can arise when pilots change their planned flight path after abandoning an attempted landing, potentially requiring manual flight without some autopilot functions at low altitude. Boeing notified operators in late August that it did not consider the issue a safety risk and is developing a software fix and a procedure to restore the function. Southwest Airlines and United Airlines have asked Boeing not to deliver new 737 MAX aircraft with the affected software. The FAA is assessing the issue and reviewing Boeing's findings, with action possible if needed. A newer account describes Boeing identifying the problem last month, while the company previously said it learned of the glitch in November 2024, initially determined that it did not require a safety review, and began a formal review after further airline feedback. A permanent fix had originally been expected in early 2028, and the issue could affect certification of the 737 MAX 10 and introduction of the MAX 7. The number of aircraft using the affected software remains unclear.