Spirit AeroSystems expects to post higher-than-expected quarterly revenue, helped by production restarting at its biggest customer Boeing after a crippling strike, the U.S. aerospace giant said on Monday.

Spirit AeroSystems ( NYSE: SPR) on Monday provided an estimate of quarterly revenue that is greater than what Wall Street analysts on average expect. The company’s biggest customer, planemaker Boeing ( NYSE: BA ), restarted production to drive the revenue gains.

Spirit AeroSystems said on Monday it expects to post a higher-than-expected quarterly revenue, driven by restarted production at the aerospace supplier's biggest customer, Boeing. Shares of the company rose about 1% in premarket trading.