It's also worth noting that we've learned the hard way that many types of accidents take-out all four engines simultaneously-- like British Airways Flight 9 in 1982 which accidentally flew through a volcanic flume and lost all four engines.

The 777 is my favorite also, it's a beautiful well-designed and well-built plane with an almost unbelievable safety record. (Barring being sabotaged by the pilot, or being shot down by a surface-to-air missile, which are hardly things you can blame on the aircraft itself.)