Not sure if this has been covered, but Aegean restricts searching of seasonal routes, even if there are available flights, which is bizarre. If you want to book online direct, and not via an OTA or by phone, you can simply select a date within their range (in the example below's case end of July) the keep moving back on their flexible fares calendar until your desired date. On the CFU-NCE route for example there were actually flights available throughout the year...
