I hold an Egyptian Passport and will book a ticket from Moscow, Russia on Aegean Airlines to Cairo, Egypt. As any foreign airlines I will transit in Athens international Airport for 8 hours, do I need a Schengen transit visa to spend those 8 hours at Athens International Airport. Are the airline hostesses going to make sure that I have such transit visa before they let me on board in Moscow Domodedovo Airport.
Per TIMATIC, the database used by airlines:
Visa required, except for Passengers transiting through Athens (ATH) and arriving from a non-Schengen Member State with a confirmed onward ticket for a flight within 24 hours to a third country which is not a Schengen Member State.
So if your trip is on a single ticket, you don't need a visa.