Why do some planes have winglets and others don't?

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This is a recent addition and you will see more of them in the future. There is a very good explanation in http://www.airspacemag.com/ASM/Mag/Index/2001/AS/htww.html Jun 30 04, 1:23 AM

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Do all galaxies have same planes in which they move or that some move on horizontal, some on vertical and others on tilted (diagonal) planes? Why do some game systems have better graphics than others? Why do planes have prefixes such as the P in P-51? Why do men have (is it called the adam's apple)and why can you see it in some and you can't in others?

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