Boeing, a major American aerospace company, is facing new technical challenges with its latest 737 MAX aircraft model. These issues are impacting the company's stock price, which has dropped by nearly 7 percent since Monday, September 28, in New York. The concern stems from the recent delay in the certification process for the 737 MAX 10, the final version of the 737 MAX series. This delay is linked to a failure in navigation software, which has caused a new postponement in the certification process. The 737 MAX 10 is a single-aisle aircraft designed to carry up to 230 passengers and is popular among major international airlines. Introduced in 2021, the model was expected to begin deliveries in 2023, but the timeline has been repeatedly disrupted by technical issues. The 737 MAX series has a troubled history, including two fatal crashes in 2018 and 2019. These incidents involved a 737 MAX operated by Lion Air and another by Ethiopian Airlines, resulting in the deaths of 346 people. The crashes were attributed to a flaw in the aircraft's stall-prevention software, and a fix for that issue is not expected until early 2028. Boeing's management claims that the current issue is separate from the past problems. The new problem involves a flight control software failure that could occur when the captain needs to adjust a pre-programmed flight plan as the aircraft approaches an airport. The company aims to have a reliable version of the software by early 2028, but it has not yet disclosed how many of its aircraft might be affected by this issue. Despite these setbacks, Boeing continues to maintain the trust of American authorities. Recently, the U.S. Defense Ministry selected Boeing to build the next-generation fighter jet for the U.S. Navy. This contract is worth more than 20 billion dollars, or slightly over 17 billion euros, highlighting the company's ongoing significance in defense manufacturing.