I had a mileage run recently on two separate A3 tickets. BER-ATH-LCA und LCA-ATH-IST.
The stay in Larnaca was less than 24 hours. The staff at the check-in counter was not able to check the luggage through to Istanbul. He also called his supervisor, who couldn't help as well...
just want to know, if it was the incompetence of the staff in BER or is it not possible at all.

btw. the schengen lounge in Athens is horribly full at noon...