Which aspect is least likely to affect the CG of an airplane?

The least likely factor to affect the center of gravity (CG) of an airplane is the weather conditions during flight. The CG is primarily determined by the distribution of mass within the aircraft, including the weight of passengers, cargo, and fuel, as well as their respective locations. Weather conditions, such as wind or temperature, can influence the aerodynamic forces acting on the aircraft but do not change the physical distribution of weight within the aircraft itself.

In contrast, the number of passengers on board, the location of cargo, and the fuel load are all direct influences on the CG. For example, adding passengers shifts the weight distribution, depending on where they are seated. Similarly, cargo can significantly alter the CG depending on where it is placed in the aircraft, and variations in fuel load can change the CG as fuel is consumed or loaded at different points. Understanding these factors is crucial for safe aircraft operation, as the CG must remain within specified limits for effective control and stability during flight.