In reply to Pumbaa1987:
Something to be aware of is the Athens-Kaly flight is sometimes cancelled at the last minute due to cross winds in Kaly
When this happened to us, we queued up for 2 hours (2 other Olympic flights cancelled at same time), were given 250€ cash in hand and told we'd been booked onto the next available Kos flight
The next available Kos flight was 5am the next day so we dossed in the airport, got the flight and were climbing before our mates on Kaly had had breakfast