Kempis... upon quick thinking (and someone will probably prove me wrong) you will most likely get routed a direct flight on AA and UA and a significant percentage of US flights. This will net you around 660 FF miles (or so).
However, flying DL via CVG will get you just a tad more than 1000 (507+ 500). You could possibly be routed thru PIT on US which would net you 1000 (500+500) as well.
Happy travels.