Found these two offers:

#1
US Airways announced that its Dividend Miles members can earn double miles for travel on
US Airways between Philadelphia and Los Angeles, Pittsburgh and Chicago (O'Hare International Airport), Atlanta and New York (LaGuardia Airport), and Atlanta and Boston.

This offer is good for travel until March 31. Members should refer to bonus request code
2088 for the Atlanta-New York and Atlanta-Boston offer, and bonus request code 2089 for the Philadelphia-Los Angeles and Pittsburgh-Chicago offer.
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#2
Between April 1 and June 1, US Airways is offering Dividend Miles members 1,000 bonus
miles for each one-way flight taken between Atlanta and Philadelphia, and Atlanta and
Washington (Dulles International Airport), when traveling on unrestricted fares.

The bonus request code for the Atlanta-Philadelphia and Atlanta-Washington 1,000-mile offer is 2090.

kind of curious as to why they are offering this bonus since they do not fly directly from La Guardia to Atlanta. Unless they are going to start direct service, i can see no great advantage to it!