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: Shares of US Airways Group (NYSE: LCC) jumped 10% in early trading after being upgraded by an analyst.

So what: Barclays analyst Gary Chase upgraded the stock this morning, saying the company's stock has underperformed competitors this year. There have also been rumors that US Airways would be a good suitor for the recently bankrupt American Airlines parent AMR (NYSE: AMR).

Now what: United Continental (NYSE: UAL) and Delta (NYSE: DAL) are also trading higher today, partly because JPMorgan (NYSE: JPM) raised its outlook for airlines. I guess analysts have to update their models after AMR's bankruptcy, but the airline business still makes me queasy. I wouldn't touch any of these stocks -- no matter what analysts say -- because long-term airlines still make a very bad investment.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.