As Freddie Laker famously said- 'book early'!
I have just been looking at our flights in June to see if there are any still available. I have not used Aegean before and to be honest I'm not being too optimisitic that things will go according to plan based on what I've heard on here. However I booked our flights on the 28th June 07 and paid £234 for 2 of us for 16nights. The flights are still available and to date the times are the same (hmmm:-\) however they are now quoting £614! Thats an amazing uplift ! So unless they cancel the flight alter the date or the time too dramatically, what a bargain!