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Old 7th September 2007 | 22:41
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archae86
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Joined: Aug 2005
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From: Albuquerque USA
737.org link

There is a quick listing of 737 winglet claimed benefits at:

737 winglet summary

My impression is that the 737 NG winglets break even on fuel use at a very much shorter sector length than do the 747-400 ones.
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