The 747 was killed by loosening the regulations on ETOPS. Going to 4 engines used to be the only way you could run certain routes (particularly transpacific an

The 747 was killed by loosening the regulations on ETOPS. Going to 4 engines used to be the only way you could run certain routes (particularly transpacific and trans-antarctic routes). Now that big jumbo twins are allowed to run those routes, running a 747 is unnecessarily expensive.