Some links: * http://travel.stackexchange.com/questions/16581/does-browsing-ticket-sites-in-incognito-mode-and-or-from-different-ips-result-i http://travel.sta

Some links: * http://travel.stackexchange.com/questions/16581/does-browsing-ticket-sites-in-incognito-mode-and-or-from-different-ips-result-i http://travel.stackexchange.com/questions/16581/does-browsin... * http://www.quora.com/Airfares/Does-searching-for-air-tickets-in-an-incognito-web-browser-prevent-airfare-search-engines-from-increasing-prices-on-flights-that-you-search-for-often http://www.quora.com/Airfares/Does-searching-for-air-tickets... * http://studenttravel.about.com/od/planes/a/The-Students-Guide-To-Finding-Cheap-Airfare.htm http://studenttravel.about.com/od/planes/a/The-Students-Guid... Short answer: they use cookies to track your searching behavior, and raise fares if you keep looking with the intent of getting you to panic buy. Correlates of high income (e.g. using a Mac or an iPhone) also hurt you.