Why Shares of Spirit AeroSystems Were Up Today

Shares of Spirit AeroSystems (NYSE: SPR) gained 10.7% on Wednesday, as key customer Boeing (NYSE: BA) restarted its 737 Max production line. Spirit's fortunes are closely tied to Boeing, its former parent, and the restarted production is good news for beleaguered Spirit shares. Spirit AeroSystems makes the fuselages for the 737 Max, and the company was having troubles well before the COVID-19 pandemic, due to the aircraft being grounded after a pair of fatal crashes.