Surely nobody keeps records of all the different types they've flown in as pax?
Some do, as a spotty teenager I kept a school exercise book as my logbook, detailing crew, route, time and comments. Once when flying the line a similar book was passed to me in the cockpit with an adult, very much travelled pax, requesting I fill it out with similar details. In fact it was quite interesting flipping through it and seeing names I knew of folks from long ago, who they were flying for, and what they were flying.