I'm sorry, but as with most companies, customer satisfaction statistics doesn't need to be approved by or reported to the public.
As with most companies, they can pick and choose the method of statistics themselves and thereby increase their good reports (for exampe through forms abord the plane right after the drinks have been served, or right after the landing, when the satisfaction is at the highest, dropping all those who missed the flight for whatever reason and when peoples judgement is at its lowest).
I don't think you'd find any reports on how statistics were made unless you have a contact at the airline.
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