Which of the following is NOT considered a common type of air cargo?

Household appliances are generally not classified as a common type of air cargo, especially when compared to categories like oversized items, perishables, and standard freight. Each of the other types has specific characteristics that often necessitate air transport due to urgency or special handling.

Oversized items include large freight that may require special handling capabilities or compliance with specific transport regulations. Perishables are items that have a limited shelf life, such as fresh food or flowers, which must be transported quickly to maintain quality. Standard freight covers a wide range of goods that fit typical shipping criteria and demand regular air transport services.

While household appliances can be shipped by air, they are not as commonly categorized under air cargo due to their size, weight, and typical shipping methods that favor land or sea transport for cost efficiency. This distinction makes household appliances the least representative of the classic categories commonly associated with air cargo.