When did e-tickets start? I've had plenty of paper Explorer tickets, both A and D, and with three, four, and five continents, but never had the option to book more than 16 segments. (Back when paper tickets were hand-written with red carbon, this was four of the four-flight ticket books with blue covers.) My first one was probably in the early 201x time period. I thought that it was a technical limitation of res systems going way back, long before OWE fares started, and unrelated to whether or not the ticket was on paper.