Boeing has been plagued with delivery delays through the late 2010s amid the groundings of its 737 MAX 8 aircraft due to concerns over MCAS, though COVID-19-induced supply chain issues and defects have compounded problems. During Q3, Boeing's deliveries plummeted to their lowest levels since 2021 following quality control issues with 737 MAX parts supplied by Spirit AeroSystems. The aircraft manufacturer has yet to release its end-of-year delivery figures, though it was reportedly in line to hit its target.