Whenever you see F# Y#, those are the number of seats authorized for purchase. For example, Y6 doesn't mean there are 6 actual seats remaining in coach. It means that we are willing to sell 6 more. Y9 is the highest it goes, so it could mean we are willing to sell 9 more seats or it could be 200 more seats. Also, the coach cabin could already be oversold ("sold above actual capacity"), but you have no way of knowing that.

*Cue the mysterious black box known as Revenue Management.*