Originally Posted by
mduell
The for sale numbers don't match actual loads, due to overbooking both into premium cabin (if any) as well as in general (expecting no-shows/misconnects/etc).
Very true but Y less than 9 is an indication of a flight nearing capacity. The exact number is still unknown but that is about the only indication one can get from the public numbers which was the OP's. The intent of the comment was to point out how little one can know or derive from the public information.