My first jet airliner ride was in a 727 of the old Northwest Orient in February of 1968. We were heading to Germany to meet up with Dad at his job working the old Interservice communication system in Europe. I was 13.
It's a good thing that the first one has been preserved and now undergoing a restoration process so it can be flown to DC and the Smithsonian Air Museum.

Photo by David Parker Brown-AirlineReporter.
Updates on the 1st 727's Last Flight Interior Photo Tour - AirlineReporter : AirlineReporter