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When an extra load is added to an aircraft, the stall speed is likely to increase. This is due to the relationship between weight and stall speed. Stall speed is the minimum speed at which an aircraft can maintain level flight before it begins to lose lift and potentially stall.

As the weight of the aircraft increases, the lift required to support that weight also increases. To generate enough lift at higher weights, the aircraft must maintain a higher airspeed. Therefore, the stall speed must increase proportionally to the increase in weight to ensure that the aircraft can safely maintain flight without stalling.

This concept is governed by the principles of aerodynamics and is crucial for pilots to understand, as it directly impacts flight safety and performance. With additional weight, the aircraft's performance characteristics change, necessitating careful attention during operations, particularly during takeoff and landing phases.