I remember "Day after Thanksgiving cartoons" on CBS when I was a kid back in the '80s... but our closest CBS affiliate at the time WTVT 13 in Tampa, FL would never air them. I remember asking my mom why they didn't show them and she said "there must be too many old people around here." And looking back, she was probably right! ;D
But on the system at my grandparents house, they were able to get CBS affiliate WINK-TV 11 from Ft. Myers, FL and they DID air the cartoons and of course then I was a happy camper.
Off topic, but this reminds me that Tampa used to always be notorious for bumping network programming. But that's probably something for another thread.