Is this really enshittification?
Prior to the deregulation of the airlines under Carter, the federal government fixed all domestic airfares. Airlines could not compete against each other on price and could only compete on perks. Flying was insanely expensive. NY to LA was $820 in today's dollars and you couldn't just shop around airlines for a better price, while you can get the same flight for less than $240 now.
It's not like flying got shittier while also getting more expensive. Flying is cheaper than it ever has been. The perks went down, sure. But so did the price. By a LOT.