While Fools should generally take the opinion of Wall Street with a grain of salt, it's not a bad idea to take a closer look at particularly stock-shaking upgrades and downgrades -- just in case their reasoning behind the call makes sense.

What: Shares of US Airways (NYSE:LCC) flew 3% this morning after Deutsche Bank upgraded the airline operator from hold to buy.

So what: Along with the upgrade, analyst Michael Linenberg boosted his price target to $30 (from $21), representing 40% worth of upside to yesterday's close. While value investors might be turned off by the stock's big run in 2013, Linenberg believes there's plenty of sky to fly given just how much the company is improving.

Now what: Deutsche thinks the stock's risk and reward trade-off is too juicy to pass up. "We are raising our rating on US Airways's shares from Hold to Buy based on an improved fundamental outlook that, in our opinion, transcends the potential uncertainty surrounding the company's proposed merger with American which has been blocked by the DOJ," noted Deutsche. "The improvement observed in the Sep Q (e.g. pre-tax margin expanded 4 points to 9.5%) combined with material revisions to our 2013 and 2014 EPS estimates underlie a revised 12 month price target of $30." Of course, when you couple the airline industry's notoriously intense nature with the stock's already high altitude -- now up 90% over its 52-week lows -- US Airways as a long-term holding seems far less appealing. 

Fool contributor Brian Pacampara has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks 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.