The market is undervaluing Southwest Airline’s growth prospects and its successful new Rapid Rewards credit card.

And in other news, the so called Southwest Effect is still in, er, effect.

Those were conclusions of an analyst and a study that weighed in on Dallas-based Southwest (NYSE: LUV) in recent days.

Despite a surge in the stock price, Southwest shares represent strong value at 17 times earnings compared to the rest of the market, concludes Mike Bermer in this Seeking Alpha article.

Airlines…