Which units are commonly used to express aircraft dimensions in weight and balance calculations?

The chosen response is relevant to weight and balance calculations because aircraft dimensions are typically expressed in inches for distance and in pounds for weight within the United States aviation system. This measurement system aligns with standard industry practices and regulatory requirements outlined by the FAA.

In weight and balance calculations, it is critical to use consistent and conventional units to ensure accuracy and clarity in the assessment of an aircraft's performance and balance. Inches provide a practical unit for measuring aircraft dimensions such as wing span, fuselage length, and overall height. Similarly, pounds are the standard unit for weight measurements, facilitating the straightforward calculation of total aircraft weight, load distribution, and center of gravity.

Other options presented utilize different units, which are less common in the context of aerospace operations in the U.S. For instance, while kilograms and meters are used in some international contexts, they don't align with the conventional measurements typically used in FAA regulatory environments. Thus, the focus on inches for distance and pounds for weight makes the chosen answer both accurate and relevant for performing effective weight and balance calculations in aviation.