The integration of American Airlines and US Airways continues as the two carriers announced Monday that it will begin code sharing on select flights starting on January 23.
Code sharing enables customers to buy a ticket for an American flight using the US Airways website and vice versa.
"Implementing this codeshare so early in the integration process allows us to begin realizing significant revenue synergies, which are estimated to exceed $1 billion annually by 2015," said American president Scott Kirby in a statement.
The first phase of the agreement will include placing US Airways code on most American flights operated between American's hubs in Chicago, Dallas/Fort Worth, Los Angeles, Miami and JFK and US Airways hubs in Charlotte, Philadelphia, Phoenix and Washington Reagan and placing American's code on similar hub flights operated by US Airways.
American will also place its code on US Airways' east coast shuttle service while US Airways will place its code on some domestic flights from Chicago and DFW for destinations that US Airways currently doesn't serve.
A few international flights will also have the code shares in place, the carriers said.
The airlines expect to have the code sharing in place for all flights in the coming weeks.