Applied for upgrades on a number of bookings (the earliest 12 days ahead, the latest in some three months), got waitlisted on all flights. Aegean helpline when questioned, explained that instant availabilities are indeed seldom and the normal procedure is to release the seats only when chances of having them properly sold are very slim, sometimes as late as few hours before the flight. Double bookings visible for all flights applied for an upgrade. All coupons still in place.