American Airlines chief executive Tom Horton and US Airways chief executive Doug Parker are scheduled to appear at a Senate Judiciary subcommittee hearing on Tuesday morning to answer questions about the merger of their two airlines.
Consumers Union representative William McGee and American Antitrust Institute Diana Moss are also on the witness list for the hearing.
Senator Amy Klobuchar (D-Minn.), who chairs the Senate Antitrust subcommittee which is conducting the hearing, has called for a review of the merger.
"I know how important competition in the airline industry is to help keep prices low for consumers without making cuts to service," Klobuchar said last month.
The hearing starts at 9 a.m. CDT and will be webcast on the Senate committee website.