I'm pricing an M fare BDL-LCA-BDL for June with return in Nov. First attempt and the return I get is LCA-PRG-CVG/JFK-BDL. It says Change Airports. So one would arrive in CVG and change airports to JFK to connect to the JFK-BDL flight.

WTH??? And with only a 1.5 hour layover to boot. How bizarre. I double checked because I was expecting to see something like a JFK/EWR airport change, not a CVG/JFK airport change.
I'm not purchasing it, of course, but it appears to be letting me go through the purchase process. Wonder what DL would do if some actually purchased this without being aware of the impractical airport change.