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3.1.1.3 finlets

Finlets are regarded as a solution to lower the amount of drag at the rear of an aircraft. On planes with upswept tails, airflow often detaches from the fuselage before reaching the end, creating a turbulent, low-pressure wake that physically "pulls" the aircraft backward. Finlets act as small vortex generators that reduce flow separation forcing the air to remain attached to the skin longer and smoothing the trailing wake.

This modification provides a measurable fuel burn reduction of approximately of up to 4% depending on the type of aircraft (source: Vortex Control Finlets). Because finlets are passive—requiring no power or moving parts—they are an ideal, low-cost retrofit. When combined with winglets and other aerodynamic refinements, finlets allow existing fleets to operate with significantly higher efficiency, providing an immediate path to lowering the industry's total carbon emissions.