[pissant]

true enough. You still gotta design the bird to be able to fly when you lose one or two engines. Gotta love that.

[Prophet in the wilderness]

On the video I got on both the 747 and the 777, they say, that the 777 basically was design to fly on only one engine.
In the testing of the 777, they had to do some testing with only one engine running.
You'll be amazed in what kind of testing they put these planes through, the torture testing, and abuse, before they certify these planes.
In one test of the 777, the pilot had to land the plane, and manage to stop the plane with only the wheel breaks ( not the speed breaks in the wings, and the reverse thrusters ) only the breaks in the landing gears were used, and the plane had to sit there for 5 ( I have to watch the video again ) or 10 mins, before the fire department can come and cool the breaks down, but, the 777 passed with flying ( pardon the pun ) colors in that test.
In most testing that they put new airframes through, they either meet or exceed the requirements on that design in the testing.