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Shares of Southwest Airlines Co. (NYSE: LUV) surged more than 3.5% this morning to hit a 52-week high. The rally came after news that the company bested fourth-quarter expectations and set a record annual profit. This is now the company's 42nd consecutive year of profitability. One of the core reasons why Southwest has been so profitable is due to falling oil prices. The company's fourth-quarter unit costs alone were down 3.8%, fueled heavily be falling jet-fuel prices.