Mind you, 9 is the MAXIMUM they can show because all seat availabilty software derives the information straight from the GDS, so when they show 9 seats available, it must be read as AT LEAST 9 seats, since airlines generally don't offer more than 9 seats in one booking and anything above is considered a group booking, which must be cleared by them first.
Similarly, many airlines also just offer up to 4 seats for immediate booking in some of their premium classes (C, F etc), so if for instance you see there are still 4 C class seats available, you're safe to say that must be read as meaning AT LEAST 4 seats available, depending the airline.
In short: 4 and 9 are two numbers which should ring a bell and mean the flight is most likely having more available seats than those numbers tell you.
Have a go at flights of your own airline which you know are wide open and see how they will always be show as 4/9 or 9/9 (depending their premium class group booking policy) and then also check some almost full flights too: they should come in really close, like for instance 1/5 or 3/7 or something....
Oh, was it an AA flight which was missing?
AA isn't shown on any of the availablity software programs as far as i know, as they have explicitly demanded to be excluded from it and categorically refuse to share any availability information from any GDS for reasons other than a firm booking... the only exception that I know of that shows AA is flyzed.com.
Flightstats is pretty sharp, just as most other availability software and that's no surprise since they all derive their info from the same GDS.
The good thing about flightstats is that it's free, whereas for most others you need to pay. The only 'problem' with it (as well as with the paying competitors BTW) is that it does not know when an airline oversells a flight: it's not because seats are still sold, that seats are still available...
For that, the only possible source is the airline itself and sadly seat maps aren't a good tool to find this out either (contrary to what I once thought).
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