We investigate the competitive effects of the merger between Delta Air Lines and Northwest Airlines (2009) in the … increases of about 11 percent on overlapping routes and about 10 percent on routes which experienced a merger-induced switch of … the operating carrier. Over a longer period, however, our analysis reveals that both merger efficiencies and post-merger …

America West Airlines - US Airways merger completed in 2005. We find that although average prices increased substantially on … routes in which both airlines competed either on a non-stop or one-stop basis prior to the merger, substantial average price … reductions observed for routes without any premerger overlap suggest that the merger led to a net increase in consumer welfare. …