In September, the FAA proposed a $3.1 million fine against Boeing for a series of safety violations, after it found hundreds of quality system violations at its 737 factory in Renton, Washington, and at the 737 fuselage factory of Boeing subcontractor Spirit AeroSystems in Wichita, Kansas, from September 2023 through February 2024. The Alaska Airlines incident in January 2024 prompted the U.S. Justice Department under then-President Joe Biden to open a criminal investigation.