Why no wingtips for B777???

Date:         13 Jul 97 01:25:56 
From:         "Lee Tze Yen, Bob" <bunnylee@pacific.net.sg>
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I've always been pondering over this question:

Why are winglets not used on the newer Boeing aircraft, for example the
B777, and the originally proposed B747-500X/600X??? If I'm not wrong, these
winglets help improve the fuel efficiencies of the B747-400. And why are
winglets used on the latest B767-400ERX????

In contrast, winglets are used on all the new Airbus models, especially the
A330/A340 variants.

Can anyone enlighten me???

Lee Tze Yen, Bob
" Friendship is so valuable
	it cannot be sold
  For it is worth more than a mountain
	just made of gold........"