While not directly applicable to your itinerary, we arrived late in the day at Athens and recovered from TATL flying in the Athens Airport Sofitel, which is a really nice hotel, before connecting to A3, actually on a separate PNR, the next day. It can be convenient for flights leaving ATH in the morning as well.

To check on possible strike activity see here:

http://livingingreece.gr/strikes/

Leaving, we sat on the tarmac at ATH for four hours due to an ATC work stoppage and were lucky to get out that day at all, ending up overnighting near JFK due to missed connections.