Online check-in opens 48 hours before your scheduled departure and remains available until the minimum check-in closure time specific to your departure airport. Passengers are kindly advised to be at the boarding gate at least 30 minutes before departure. At Athens International Airport "Eleftherios Venizelos", the gate closes strictly 15 minutes prior to departure. 
Please note that after this time, any assigned or selected seats may be reassigned at the discretion of AEGEAN or Olympic Air, depending on flight capacity and operational requirements.