What are the four forces acting on an aircraft during flight?

The four forces acting on an aircraft during flight are lift, weight, thrust, and drag.

Lift is the force that acts perpendicular to the direction of motion and is generated by the airflow over the wings. It is essential for overcoming weight, which is the force due to gravity pulling the aircraft downward. Thrust is the force produced by the engines to move the aircraft forward through the air, overcoming drag, which is the aerodynamic resistance that opposes the aircraft's motion. Understanding these four forces is critical for pilots and engineers in determining how an aircraft behaves during different phases of flight, such as takeoff, cruising, and landing.

The other options include incorrect combinations of forces or terms that do not accurately categorize the fundamental forces at work in flight. For instance, options that list stability and control are related to the aircraft's performance and maneuverability but do not represent the basic forces affecting flight.