US moves to block American Airlines and US Airways merger
13 August 2013 Last updated at 19:08 BST
The US justice department has filed an anti-trust case to block the merger of American Airlines and US Airways.
The $11bn (£7bn) deal, which would form the world's largest airline, was backed by a federal judge in March and has been approved by the European Union.
The complaint says customers would see a price rise as the merger would "substantially lessen competition" in the domestic market.
Michelle Fleury reports.