Final Delta flights out of Athens Airport ATH (Airfrance, Alitalia, KLM)

I'm booking a trip to Athens, Greece from JFK. I planned on returning to the US on March 18th, but I called Delta, who told me that the last day that their partners (Airfrance, Alitalia, and KLM) will be flying out of Athens is March 17th. So, I am booked for March 17th, the last flight from Athens according to them.

Does anyone know why Delta is stopping their flights after the 17th? They didn't say why, but I could only think of corona virus-related precautions or issues with Turkey.

Is this any reason for concern? Could I end up getting stranded in Greece? If it matters, my flight has a short layover at CDG.

Any insight regarding this specific situation or situations similar to it is greatly appreciated.