How is a drag a disadvantage when flying a plane?

Drag is a disadvantage when flying a plane because it opposes the forward motion, requiring the aircraft to use more thrust to maintain speed. Increased drag can lead to higher fuel consumption, reducing the aircraft's range and efficiency. Additionally, pilots may need to adjust their flight path or altitude to counteract drag, which can impact overall flight performance and safety. Managing drag is crucial for optimizing flight operations and ensuring effective fuel management.