American Airlines and US Airways plan to launch the second phase of their codeshare on 6 February, expanding the connectivity between their networks.
The expanded codeshare will cover 6,500 daily flights and include more than 275 destinations across the two networks, according to the Fort Worth, Texas-based carriers.
Only select international destinations will remain outside the codeshare due to regulatory restrictions, American says. Full codesharing across their entire networks is expected by the end of the first quarter.
“This expansion marks another milestone for American Airlines as we successfully implement the world's largest codeshare, providing our customers convenient access to the best network in the business," says Scott Kirby, president of American, in a statement.
The carriers implemented the first phase of their codeshare, which included hub-to-hub routes and the Boston-New York LaGuardia-Washington National shuttle, on 13 January.
US Airways plans to leave the Star Alliance and join the Oneworld alliance at the end of March.
American and US Airways closed their merger in December 2013 and plan to move to a single operating certificate by the end of 2015.