Originally Posted by
nall
I always have this secret suspicion that airline websites may charge higher prices if they see you are a frequent flier.
All prices are based on availability in particular fare classes of published fares for particular routings. Availability can fluctuate and different sites can construct fares in different ways, but they are all using the same data. [Except in the rare instance that a site has access to unpublished fares!]
So I don't see any means for manipulation.