Why Don’t Any US Airlines Operate The World’s Largest Commercial Aircraft?

In 1969, the United States led the world with giant widebody commercial aircraft as Pan Am became the launch customer for the Boeing 747 Jumbo. The Boeing 747 was enlarged in subsequent variants and proved a massive success both in the domestic US and international export markets. Fast-forward to today, all remaining passenger 747s are in service with foreign airlines, and there are no double-decker or quad-engined aircraft in passenger service with US airlines.