Studying the skin of the great white shark, which reduces friction drag by lifting turbulence vortices away from the surface, could lead to fuel-saving applications in aircraft and boats.

https://arstechnica.com/science/2024/08/how-the-great-white-shark-reduces-drag-while-swimming-at-different-speeds/

Studying the skin of the great white shark could help reduce drag in aircraft

High-ridged denticles reduce drag at low speeds; alternating ridges do so at high speeds.

Ars Technica
@davidho I also recall hearing about this in the 90ies, for airplane fuselage application. Did it take those long to commercialise? I actually assumed airplanes were already doing this.