Remember too that seatcounter.com (and some other sites) show at most 9 seats, so when you see 9, it could mean actually 9 or it could mean that the airline is willing to sell 50 in the fare class. One also needs to be cautious in interpreting the combinations of codes--i.e., does Y5 B3 mean that there are eight seats to sell or that there are only 5, of which at least 2 must be sold at a full Y fare?