Are you going to DL or WDW? I can't keep everyone straight. I'm going to DL and I got mine by mail last Tuesday. I e-mailed it back to them on Wednesday and received my itinerary on Thursday. DH made me change our flights so I had to send it back Friday morning and haven't heard back from them yet. I just want to get it booked so I know the dates and flights are for sure.
I emailed our itinerary back Saturday, so hopefully we didn't lose our flights by taking too long to approve them. Our friends are on the same flight, so it would stink to be on different flights. I would hope that Disney has some way of locking down a reservation until it gets booked. Or maybe they book it, and don't have to pay to change it, if necessary.