Airline Networks, Mergers, and Consumer Welfare

We study the consumer welfare effects of mergers in airline networks. Based on the development of a general classification of affected routes, we apply a difference-indifferences approach to exemplarily investigate the price effects of the 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.