I was elementary school age at the time, but I seem to recall having some sort of rudimentary seat back entertainment system when my family would fly PIT-SEA in the mid '90s (like '93 to '96). I have memories of my mother swiping her credit card which gave me access to some very basic, black and white games (almost early Nintendo Game Boy-esque). I do remember using the phone console to control the game.

I could swear those PIT-SEA flights back in the day were on 737's, but I could be totally wrong. Also entirely possible that I'm mixing this up with some other early experience in life, although living in PIT in the '90s (and being a young airplane dork even then), I'm pretty confident we only flew US.