FlightStats Availability on EK
 

Been tracking availability for some upcoming travel between DXB and the UK. I notice that FlightStats' figures for flights which seem to be wide open vary between showing 9s and 7s. This seems to be unrelated to aircraft type - e.g. in the past few days I've seen A380 flights showing all the nines, and the same flights a few days later showing all the sevens. Why is this?

I have infact notices that the flight stats figures don't seem to be accurate. There is too much variation in their figures.
I recently took a flight which according to flight stats did not have 1st class but when i boarded it did. Also alot of times it sometimes shows me the flight as overbooked and then a day later as wide open.

Are there any other websites that offer this kind of data? I had tried expert flyer but it needed me to pay before using.