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.
Jalopnik

Here's Why Planes Have Those Curved Winglets You've Probably Wondered About

Millions of consumers trust airlines with their lives each day, but few passengers understand how these massive flying tubes stay airborne and why they look the way they do. I don't remember jets ...