777 No Winglets
A common interview question with CX is asking why the 777 does not have winglets. I was doing some reading on this, and for the most part all I can find is that the 777 wing is simply more efficient and does not need winglets; however, I can't seem to find a good explanation as to what makes the wing more efficient. Again, some sources say its because the 777 has a supercritical airfoil, but I've read elsewhere that most jets have supercritical airfoils these days, yet many a/c still have winglets.
Can someone please shed some light? Thanks.