I confess that I'm baffled by the ardor to find an alternative explanation. The major airlines routinely boast of their surveillance pricing plans and programs. The people who develop, consult on and manage loyalty programs brag that frequent customers don't notice when prices go up. AC has a monopoly on the route.
The same URL in two browsers, one logged in, and one not, produces a 25% premium price for the logged in session.
Occam's razor applies.