What does an increase in drag usually lead to for an aircraft?

An increase in drag typically leads to a decrease in speed for an aircraft. Drag is the aerodynamic force that opposes an aircraft's motion through the air, making it harder for the aircraft to maintain its speed. When drag increases, the engines must work harder to overcome this resistance, which can result in a slower cruise speed if the throttle settings are not adjusted accordingly.

In the context of flight, pilots and engineers must be mindful of drag because it directly impacts the aircraft's performance. A high drag environment, such as during takeoff, landing, or when flying through turbulent weather, can significantly affect the aircraft's ability to climb and maintain its desired speed. Therefore, managing drag is crucial for ensuring efficient flight operations and optimal performance.