[QUOTE=dadamn;22159767]I wonder if it would be possible to book a ticket, then change the dates past the cert expiration. I'm assuming that once you book a ticket, you're now bound by the rules of the fare class, the only thing preventing you from changing the ticket would be if there's something explicitly noted on the ticket that it was a companion cert… and of course there'd likely be some change fees and paying the fare difference. All speculation of course, never actually tried it.[/QUOTE
I am almost positive, the ticket will be noted as using certs and the original expiration date. Plus, why would you want to do this? You will pay $400.00 in change fees ($200.00 per ticket).
I also doubt you will get Amex to send out new certs early. They have pretty much gone ahead and changed it so that they actually go out the month AFTER your card renews.