Molly said:

SE was 1997.

USA did air the three movies together in a marathon run, I'm pretty sure they did so on Christmas of either 1993 or 1994 (based on where I was living at the time). It was my first exposure to any of them.

Yes, it was December 1994 but not quite Xmas. Two decades on, I remember this vividly because I was in the Caribbean at the time and a friend of the family had the USA Network on their cable option.

Watching TESB and ROTJ was one of the highlights of the trip. :)

Edit: just had a flashback of the promo for the marathon, so I did a YouTube search with the term "Star Wars USA Network" and it appears the OT was shown on USA from summer 1993 through to 1995.

Here's one of the promos.

https://www.youtube.com/watch?v=6zp0TaxwxZ8