Boeing CEO Dennis Muilenburg is out. The aerospace company’s boss is resigning as the firm reels from the crisis caused by crashes of its 737 MAX jetliner. David Calhoun, a board member and executive at private-equity firm Blackstone, will replace the embattled Boeing chief.

The plane manufacturer’s reputation has been battered following two fatal crashes in which more than 300 people died. Calls from the victims’ families and politicians for Muilenburg to step down have grown louder as Boeing has tried to manage the crisis. The company’s 737 MAX aircraft remain grounded and production of the model has been suspended, a disruption that could ripple through the US economy.