The Wall Street Journal reported Monday afternoon that airlines were notified in August of a previously known glitch that could cause an automated navigation function to cut out during aborted landings.

The report said some airlines have requested deliveries with an older software version that avoids the glitch.

But, now, Boeing must develop a software patch to fix the problem. 

Bloomberg reports that certification of Boeing's long-delayed 737 Max 10 variant will be held up by the Federal Aviation Administration over a new software issue, just as the US planemaker was in the final stages of winning approval to begin deliveries to airlines.

The FAA is holding off on certification of the largest member of Boeing's best-selling narrowbody family until it has determined whether or not a recently flagged software concern constitutes a safety of flight issue, Administrator Bryan Bedford told reporters on Monday at an event near Washington.

News of the FAA approval delay sent Boeing shares down 6.1% in late-afternoon trading, the largest intraday decline since Ocotber 20, 2025.

Ortberg told investors this month that the new jet could be approved "very soon" after FAA regulators cleared the shorter 737 MAX 7 earlier this summer. 

Orders for the 737 Max 10 exceed 1,500 aircraft, making it one of the more popular Max variants.

The new MAX 10 is designed to carry more passengers and lower operating costs per seat. It can seat up to 230 passengers, compared with 220 for the MAX 9 and 210 for the highest-capacity MAX 8.