From what I've heard in at least a half dozen US markets with a Classic Hits station and Jack-Mike-Lake-Spot-Drive-type Adult Hits station, there's a pronounced difference in formats. Jack stations tends to be more 80s-90s and even 00s based, while Classic Hits holds true to 70s-80s, occasionally touching the 90s. Jack-type stations offer a more broad range of artists, where for example, a Def Leppard hit from the 80s plays before or after an 80s or 90s pop hit. That said, Jack stations don't offer a deep playlist, while Classic Hits stations offer more consistent and deeper playlists. The DC format battle should be interesting given that DC is an Urban market. It's more than likely the Drive's playlist will reflect this with more Churban 80s hits (as previously mentioned in this thread) than some other 80s Jack-Drive stations in say Kansas City, Cleveland or Buffalo.