Which speed indicates a safe maximum operating speed for normal flight operations?

Vno, which is the maximum structural cruising speed, indicates a safe maximum operating speed for normal flight operations. This speed represents the upper limit of the green arc on the airspeed indicator and is the maximum speed at which the aircraft can be safely flown in turbulent air. It is also the speed above which the pilot should exercise caution, as flying too close to Vne (never exceed speed) could result in structural damage if the aircraft encounters turbulence or if abrupt maneuvers are needed.

While Vfe (maximum flap extended speed) is important for operations during approach and landing with flaps deployed, it is not relevant to general operations at cruising speed. Similarly, Va (design maneuvering speed) is crucial during turbulent conditions but does not serve as the upper limit for structural cruising speeds. Vne, on the other hand, represents the maximum speed that should never be exceeded under any circumstances. Therefore, Vno is the correct choice for maximum safe operating speed in normal flight.