What is 'flew level flight' in aviation?

'Level flight' in aviation refers to a state of equilibrium where the aircraft maintains a constant altitude. This is achieved when the forces acting on the aircraft are balanced. Specifically, in level flight, the lift generated by the wings equals the weight of the aircraft, ensuring that it neither climbs nor descends. Additionally, for the aircraft to maintain a steady speed during this phase, the thrust produced by the engines must equal the drag created by air resistance.

The condition described in the correct answer encompasses both the necessary vertical and horizontal balance of forces. By meeting the criteria of equal lift and weight, as well as thrust and drag, the aircraft can cruise smoothly and efficiently without changing altitude or speed. Understanding this balance is crucial for maintaining control and achieving safe flight operations.