As it continues an about-face from rapid growth to cutting costs amid the grounding of the Boeing Co.âs 737 MAX, Spirit AeroSystems Inc. has rolled out a voluntary retirement offer to some of its salaried workforce. ⢠Be at least 55 by July 1, though some have to be 62 depending on the specific program they work on. ⢠Have a pension plan that transferred from Boeing to Spirit following the spinoff of the local company in 2005. A Spirit spokesperson did not respond to questions from the WBJ Thursday morning, including how many employees the company was expecting to trim through the voluntary retirement offer.