Southwest Airlines Co (NYSE:LUV) shares are trading higher by 4% to $31.35 during Tuesday’s session. Shares of several airline stocks are trading higher in sympathy with United Airlines Holdings Inc after the company reported better-than-expected fourth-quarter financial results. Additionally, Southwest Airlines pilots, represented by the Southwest Airlines Pilots Association, have reached a new labor deal with the airline. The agreement entails a pay increase of around 50% for the pilots over the next five years. The negotiations, which included discussions on pay, retirement benefits, disabi…

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