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: US Airways (NYSE: LCC) shares popped 11.3% in intraday trading today after the company reported better-than-expected quarterly results that beat Wall Street's expectations.

So what: US Airways reported the first profitable fourth quarter it's been able to muster since 2006. The quarter also showed some signs of improving economics for the industry matched with "discipline" regarding capacity.

Now what: Bear in mind that major rival United Continental (NYSE: UAL) also reported a heartening quarter. Some of the positive tidings have to do with airline companies' ability to raise air fares recently. Investors should remain cautious regarding airline stocks, though. Continued high unemployment and food and energy price inflation imply that economic recovery isn't a done deal, and airline companies could still end up grounded.

Interested in more info on US Airways? Add it to your watchlist here by clicking here.

Alyce Lomax does not own shares of any of the companies mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.