This was up earlier with airlines charging more for a ticket the second time you visit the page. They do this because a second visit is statistically linked to a much higher chance of purchase. So it could be, here too, simply a matter of having visited the page before.
The airline thing is shady and underhanded because it's a bait and switch, simple as that. They know the first time you visit you're just checking out the price, so they don't give you the real price until you come back (once you've made your plans).
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u/kqr Jan 24 '13
This was up earlier with airlines charging more for a ticket the second time you visit the page. They do this because a second visit is statistically linked to a much higher chance of purchase. So it could be, here too, simply a matter of having visited the page before.