Alitalia has a very competitive award chart - they are also in SkyTeam and would have access to the same SkyTeam partner award seats as Delta or Korean. They are an AmEx MR transfer partner. Award chart here:
https://www.alitalia.com/content/dam...m-2016-ENG.pdf
Find the flight availability on Air France or Delta site, then call Alitalia to book (can't book partner awards online). Get the phone agent to confirm availability before transferring points though.