I want to share an article (in Spanish) about this:
Avianca and Song initiate commercial alliance to E.U.
Within the framework of the expansion plan and consolidation of the network of routes and services, Avianca initiates today an agreement of Code Sharing with the American airline Song, low cost travelling filial of Delta Air Lines. The travelers coming from any city of Colombia served by Avianca will be able to connect through Song with New York and Boston, via Fort Lauderdale. These two destinations will be additional to the code sharing between Avianca and Delta Air Lines already in place, that allow the passengers who leave Bogota to connect from Atlanta with Boston, Chicago, Dallas, Los Angeles and Washington. On the other hand, the travellers coming from any city of the United States served by Delta can connect from Bogota with Barranquilla, Cali, Cartagena, Medellín and Pereira, via Avianca.