The proposed merger of American Airlines and US Airways will reduce competition and lead to higher fares, critics of the union argued before a U.S. Senate panel Tuesday.
But supporters of the merger said the creation of the nation's largest airline will improve service and protect the jobs of hundreds of airlines workers.
The testimony came Tuesday before the Senate Subcommittee on Antitrust, Competition Policy and Consumer Rights.
The merger, which was announced last month, must still get approval of the U.S. Department of Justice and the judge overseeing the bankruptcy proceeding of AMR Corp., the parent company of American Airlines.
Sen. Mike Lee (R-Utah), the ranking member of the panel, noted that the newly merged airline would control nearly 70% of the passenger gates at Ronald Reagan Washington National Airport.