Boeing stock is down today due to investor concerns over production delays and potential labor disputes despite reporting better-than-expected revenue and smaller losses. Specifically, the certification process for Boeing's new 777-9 and 737 MAX 7 and 10 models has been postponed until 2026, which presents a significant obstacle. Additionally, Boeing workers rejected a proposed contract, raising the possibility of strikes that could disrupt production. These issues have overshadowed some positive developments such as improved jet deliveries and second-quarter financial results, leading to a decline in the stock price today.