The barrier to entry is definitely not "100% over-regulation". Starting an airline would be extremely difficult even if it were entirely unregulated. You need airplanes, pilots, and a variety of flight and ground crew. You need landing slots at busy airports. And then you need a customer base big enough to fill up your flights.
Even if all of that were easy, you still want anti-trust regulation, because airlines are a cutthroat business. If you start up NerdBird Inc, specializing in SF-Austin flights, it is absolutely in the interests of United and American to undercut you on that route for as long as it takes to drive you out of business. Which will probably not be very long, as airlines are expensive to run and margins are thin.
Look at what happened to Virgin America? It was a consumer-focused airline that was doing very well financially, and it was forcibly acquired because of regulations that US airlines must be US owned.
Yeah, read the article. He was against the merger - regulation drove the forced consolidation, which he did not want. He posted about it a ton when it happened.
Even if all of that were easy, you still want anti-trust regulation, because airlines are a cutthroat business. If you start up NerdBird Inc, specializing in SF-Austin flights, it is absolutely in the interests of United and American to undercut you on that route for as long as it takes to drive you out of business. Which will probably not be very long, as airlines are expensive to run and margins are thin.