Why doesn't the world's fastest commercial aircraft have winglets?

The Boeing 747-8's innovative raked wingtips offer a sleek, integrated solution to reduce induced drag.

Here’s how much different the Airbus A350’s winglets are compared to the A330neo

The A350's winglets are much larger than the A330neo's, an aircraft that partially followed the A350's winglet design.
National Academies of Sciences%2c Engineering%2c and Medicine

Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft

Suggested Citation: "1 Background and Overview." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The ...
Aviation Week

Regulators Order Boeing 757 Winglet Checks

Operators of Boeing 757s with a certain type of Aviation Partners Boeing (APB) winglets are inspecting the assemblies for cracks following reports of five aircraft with issues and quick action by the ...
National Academies of Sciences%2c Engineering%2c and Medicine

Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft

W. Mangler, 1938, “The lift distribution of wings with end plates,” NACA TM 856; transl. by J. Vanier from “Die Auftriebsverteilung am Tragflügel mit ...