Modern engines have extremely low failure rates and can generate much higher shaft power and thrust than early types. This makes twinjets more suitable than they were before for long-haul trans-oceanic operations, resulting in eased ETOPS restrictions; modern wide-body twin-engine jets usually have an ETOPS 180 or even (in the case of the Boeing 777 and 787) ETOPS 330 rating. As such, having more than two engines is no longer considered necessary, except for very large or heavy aircraft such as the Boeing 747, Airbus A380 (over 400 seats in a mixed-class configuration), Antonov An-124, and An-225, or for flights through the Southern Hemisphere, primarily to and from Australia (which has not yet adopted the ETOPS 330 standard), where the most direct route for some flights is over Antarctica.