good idea Peggy - I just emailed them and got a response back in about fifteen minutes, so I'm going to go ahead and book - sounds better than switching buses:

We will find out by Icelandair’s schedule when your flight is due.
If there is a considerable delay we find solution for that.
We will be waiting with a sign with your name on it.
You can pay us by credit card or paypal if that suits better.

Leslie