We investigate the competitive effects of the merger between Delta Air Lines and Northwest\ud Airlines (2009) in the domestic U.S. airline industry. Applying fixed effects regression\ud models we find that the transaction led to short term price increases of about 11 percent on\ud overlapping routes and about 10 percent on routes which experienced a merger-induced\ud switch of the operating carrier. Over a longer period, however, our analysis reveals that both\ud merger efficiencies and post-merger entry by competitors initiated a downward trend in prices\ud leaving consumers with a small net price increase of about 3 percent on the affected routes. \u
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