According to an Aegean agent tonight, all international flights up to May 31st have now been cancelled. She said that the aim is to begin offering service again on June 1st. With the progress being made with containing Covid-19 in Greece, this appears possible but only to certain destinations. I rebooked a one-way flight from LCA-ATH-LHR from May 23rd to January 11th next year. The very helpful lady said that voucher upgrades were not currently available on the booking system but, when the ticket was e-mailed two minutes later, both sectors were in I class and endorsed 'due to coronavirus/free seat upgrade.' This was the second time of rebooking.