I think they may have changed that option so you can only see seats once in the booking process. I booked a flight about 10 days ago (for a flight in September) and went to look for it online, it was not showing up. I then looked it up using my confirmation code and guess what? It was cancelled and rebooked for the next day! No email or call to let me know. So I used the chat feature to rebook the flight (different airport, was Providence, now Boston, but about the same time) and I mentioned to the person I could not see the seating chart. I wanted to see how many open seats there were to try and gauge if this flight would be cancelled at a later time, too. He said I wouldn't be able to see it until I was in the booking process. Who knows? I was not happy they didn't even bother to email me about the change, it was not like it was an hour or two, it was a different day!