A question answered by two questions, great, I think I see your point though.
Skyway does not operate an aircraft configured with more than 70 seats, but then neither does ACA (yet). However, Skyway's parent company, Midwest Holdings, does currently operate jets well in excess of 70 seats.
It's anyone's guess what kind of code share arrangement there would be. ACA was what we could call a DCI-type code share. American Eagle, as I understand it, is more of a block seat purchase on certain LAX flights. That seems closer to the "reverse code share" that a judge just levied a substantial fine against AMR in favor of APA.
Is that how Delta could circumnavigate your PWA? Just buy some/all the seats on flights that coincidently fly in and out of DAL hubs.