These are certainly routes DL needs if they want to fully fill out BOS, but man I don't see how BOS/ORD doesn't just set money on fire. BOW/EWR and DCA is at least it's UA/B6 and AA/B6 as the competition.
But to ORD we're looking at AA, B6, UA , NK to ORD and WN to MDW. Fares are already less than $200 each way. I don't even know what DL is going to have to offer to elbow in to this market.