Airline deregulation was opposed by nearly all US airlines in 1978. It was championed by Senator Ted Kennedy (and his aide now Justice Stephen Breyer) and by consumer advocate Ralph Nader and signed into law by Jimmy Carter.
Bob Crandall was against deregulation then, and he’s against it now in retirement. And he’s blaming it for cramped airline seating. He also calls codesharing a ‘fraud’ to fool people.