“In 1978, Congress passed and then-President Jimmy Carter signed into law the Airline Deregulation Act, which was part of a deregulatory zeal that grabbed national lawmakers in the 70s and 80s, and led to the deregulation of vast swathes of the economy, from trucking to railroads to telecoms to, perhaps most famously, banking and finance.
A provision in that law wiped away the ability of anyone in state government to make rules or do any enforcement “related to a price, route, or service of an air carrier.”
https://boondoggle.substack.com/p/how-airlines-fly-away-from-accountability