While there doesn’t seem to be hard evidence of airlines offering different prices bases on cookie/IP identification of site visitor, the possibility of this shouldn’t be dismissed either, especially considering visitor tracking methods employed by advertisers on the internet, for example.
Using Incognito mode on your browser, preferably coupled with an ad-blocking add-on, would be useful . VPN service might be of help too. (Yes, I’m a bit on the paranoid side, but that never hurted anyone)
Credit:stackoverflow.com‘