Which type of aircraft commonly utilizes vortex generators?

Vortex generators are small aerodynamic devices attached to the surface of an aircraft, and they are primarily used to enhance lift at lower speeds or to improve the flow of air over the wings and control surfaces. The correct choice, which indicates high-lift and slow-speed aircraft, is accurate because these types of aircraft benefit significantly from the control and performance enhancements that vortex generators provide.

These devices help to delay flow separation on the wings at critical angles of attack, thereby improving the overall aerodynamic efficiency and allowing the aircraft to maintain control at slower speeds, which is particularly important during takeoff and landing phases.

Commercial jets are indeed equipped with vortex generators; however, they are not restricted to just this type of aircraft. Similarly, while military fighter jets and experimental aircraft may employ vortex generators for specific performance reasons, the main design intention for vortex generators is tied closely to high-lift operations and enhancing performance in slow-speed conditions. Therefore, the most comprehensive category that encompasses the typical application of vortex generators is high-lift and slow-speed aircraft, making it the most fitting choice in this context.