My how times have changed. When I flew for Eastern in the 80s and early 90s we ran full 727-200s on that route. We served premium hot meals which was quite a challenge since actual flight time was often only 45 minutes. I also remember we carried large numbers of Hasidim commuting between their communities in Brooklyn and rural Quebec. When Eastern shut down, LGA-YUL was one of the first routes Delta went after.
I work for Southwest, but the views expressed are my own and do not necessarily represent those of Southwest.