We are booked with a pin code this year for the first time. The last 2 years I have booked a trip over thansgiving well before the 6 month dining window. This year we decided to put off the trip until March 2011 becuase we had a lot going on. well, me who has never got a pin code, ever, started getting every one that came out and it made me sick that we couldn't use them. Well, we go back to achool, and my boss is less than thrild about me taknig 2 days off in March to go over Mardi Gras. Fd comes out and we have to moove our dates to get it, which means we lose a park day and are really rushed traveling. So, we look at the buget and decide that going over Thanksgiving with a FD pin makes more sense. we get back the lost time, don't have to rush, and it is only $100 difference in price. So yes, you can use a pin code after booking the GP FD offer.