USAir purchased the LGA rights from the former Eastern Airlines. They operate from EAL ols terminal in LGA, US spent over $250 million to modernize the present day facility, which was finished in 1994.
Along with the LGA operation, came the USAir Shuttle, which was purchased by billionaire developer Donald Trump. US took over the shuttle in 1992 or 93, and operated it on behalf of Mr. Trump, until it was outright purchased in 1997 or 98.
The flights that US operates are quite succesful. MAny of the former Empire Air routes are still operated to upstate NY.
With the slot exemptions of commuter a/c, came the insane expansion of these past 2 years, that led to the impossible delays at LGA.
That has since been restricted to a certain number of operations by commuter a/c. All of the commuter airlines in/out of LGA were subject to a slot lottery to alleviate congestion.
The LGA operation is one of the crown jewels of the USAir system. It is probably the nicest terminal in the airport, and provides service to all of US major hubs, as well as flights to FL, and as far west as Kansas City.