Keep an eye on price-to-earnings multiples for airline stocks, according to TheStreet's Action Alerts PLUS Portfolio Manager Jim Cramer. Cramer said Alaska Air (ALK) and Southwest Airlines (LUV) are seeing their price-to-earnings multiples increase. "They're now at 12 - that gives an umbrella to the companies that were selling at just 6 and 5 times times price-to-earnings multiples, that are now at 7, 8 and 9," Cramer said. "I'm talking about American Airlines (AAL) , Delta Air Lines (DAL) and United Continental Holdings (UAL) ." Cramer spoke earlier from the floor of the New York Stock Exchange.
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