October 4--- we had FOP, but after riding it mid-afternoon (our 3rd FP), I booked a throw away and began trying to refresh modify to get Navi. Navi didn't pop up, but FOP did so we rode it again. I continued trying to refresh to get Navi, and wasn't having luck there but FOP was popping up quite a bit. Just as we were getting in line to wait an hour for Navi, I was able to get Navi for 45 minutes later. Party size can make a difference- and there are only 3 of us so that probably helped. Even if you don't get it before your trip, don't give up!