Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Spirit AeroSystems (NYSE: SPR) shares tumbled as much as 11% in trading today after the company released earnings.

So what: Adjusted earnings per share of $0.39 missed estimates of $0.44, and the company cut its full-year forecast. Boeing's (NYSE: BA) 787 Dreamliner delays have hurt results, and management said further delays would affect whether the project is profitable for Spirit.

Now what: Pinning hopes on the perpetually delayed Dreamliner doesn't seem to be working out too well as the company takes charges related to contract estimates. But Spirit still operates in a growing commercial airline space and is operating a profitable business. I'm willing to take a chance on this stock because of a forward P/E of less than 10  and a buy opportunity from investors spooked by an earnings miss.

Interested in more info on Spirit Aerosystems? Add it to your watchlist by clicking here.