<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Not even close.... B777s two engines provide more power then all four of the engines on 342/343, and only slightly less then the four on the 345/346. And the two engines are two less engines for something to go wrong with. and the 2 across is a matter of airline configuration, not the manufacture of the plane.
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The A340-600 is a much better aircraft than the 777---it can carry just as many passengers and way more cargo. From what I have been told, AA is not to happy with their 777's. The 2 across thing not really an airline configuration thing. The 777 has enough width to put in 2/5/2 seatting or 3/4/2. I have never seen an airline put in 2/4/2 in Y on a 777. The 330/340 series would be to cramped to put in anything more than a 2/4/2.