Totally untrue. I have heard the term "flyover country" since the early 90s, and I am betting it was used before that time...
Jason Aldean had a number one hit called “Flyover States” a few years back. But I’ve heard the expression before. A good song by the way.
The real America lies between the coasts and I say that as one who lives on one of those coasts. For many years, those in flyover country felt held hostage by the coasts. I guess now that things have flipped for the time being, the urbanites are not liking the shoe on the other foot.
I live and work in NYC area and I’m drowning in liberal tears. They are such babies when they don’t get their way.
I recall Rush using the term in the very early 90’s.