I'm flying with my partner who works for Continental Airlines from Washington DC to Athens to attend a friend's wedding. I'm planning on leaving Washington, DC on either Thursday, June 26 or Friday, June 27 to arrive the following day. I plan on departing Corfu back to the US on Monday, June 30.

Getting to Athens on an ID 90 won't be an issue, but I have no idea how challenging it is to get on a flight from Athens to Corfu and from Corfu back to Athens. Are the loads on these flights particularly heavy?

I have several options:

1) Don't do a thing. Get into Athens and try to use the ID 90. Only advisable if the flights don't oversell.

2) Purchase a fully refundable yet expensive ticket on Olympic Airways. In this case, we'd be able to cancel the ticket (without a penalty) in the event we can't get on a flight using an ID 90. (~$800)

3) Purchase two non-refundable tickets (~$600)

So if anyone knows what the typical loads on these flights are in late June, please let me know.