Carl Icahn. Ask the long time employees of TWA. I’ll bet they’ll burn up the keyboards responding to your query. True... Carl did not own an airline, but just the same... he purchased an airline, and ran it into the ground.

You may not be old enough to remember Frank Lorenzo, and what he did to Eastern Airlines.

US carriers are subtle as to what they are doing to shave expenses and increase profit margins in the name of code sharing which in fact is outsourcing de facto.