Yes, I remember those fares, before USAir bought and dismantled PSA, as AA did with Air California. Also, $19 got you between EWR and DCA on People Express, before CO put an end to that.

During the 1970s regulated days, Icelandic Airlines remained out of IATA, and I paid $140 RT youth fare JFK-LUX (since Luxembourg didn't have an IATA-regulated airline, either). You could even get a $19 stopover night in REK with hotel, since Iceland was starting to promote itself as a destination.

Wait, did I just reveal how OLD I am??