To cancel Aegean Airlines flight tickets and receive a refund, you can follow these steps:
Log in to your Aegean Airlines account and select the "Manage Booking" option.
Choose the flight you wish to cancel and click on the "Cancel Reservation" button.
Review the cancellation policy and confirm your cancellation.
You will receive a refund according to Aegean Airlines Refund policy, which may depend on the fare type and timing of your cancellation.
It is recommended to check the airline's website for the most up-to-date cancellation and refund policies.