Airline ticket prices have been highly individualized for at least a decade. I live a nomadic lifestyle and I'm often traveling with friends from various countries. We can sit next to each other in the same café and search for the same plane tickets on the same website at the same time, and get entirely different price offers. This is one of the reasons that I never buy plane tickets without using incognito mode or some sort of private browsing, but even doing that affects the price that you're offered.