This year's second-to-last trading day offered nothing but declines for the major American indexes. The industrial-heavy Dow Jones fell by 1.0 percent, Nasdaq's composite index dropped by 1.2 percent. The S&P 500 ended the day at minus 1.1 percent.
Over the weekend, at least 179 people died in an accident at Muan Airport in South Korea. It was a Boeing plane that encountered problems during landing.
The company's stock plummeted in conjunction with Monday's market opening, but recovered somewhat during the day and ended at minus 2.3 percent.
Boeing has had several turbulent years behind it, partly due to problems with the 737 Max aircraft type. During 2024, the aircraft giant lost around 30 percent of its market value.
Other aircraft manufacturers also had a tough time on Monday. For example, the aviation-heavy conglomerate Textron, which owns Cessna, among other things, fell by 0.8 percent. Additionally, Boeing's European competitor Airbus lost 0.6 percent earlier in the day.
The decline also affected several highly traded tech stocks. Examples include Tesla, down 3.3 percent, Facebook owner Meta, down 1.4 percent, Google's parent company Alphabet, down 0.7 percent, and processor giant Intel, down 2.4 percent.
Among the winners was semiconductor giant Nvidia, which rose by 0.4 percent.