Originally Posted by
davetravels
Well, I certainly don't claim to be a know-it-all, but, in theory, usually F7 Y3 - or, 10 seats available for sale means that it's not overbooked/sold.
You're forgetting that available F seats influence the amount by which Y is overbooked. If it doesn't look like F is going to sell or go to medallions, a good RM software will overbook Y, in this case, by an extra 7 beyond what you would normally see.