Which factor primarily determines the maximum cargo package size for scheduled airline shipments?

The maximum cargo package size for scheduled airline shipments is primarily determined by the type of aircraft and its dimensions. Each aircraft has specific capacity limitations based on its design, including the maximum weight it can carry and the space available for cargo. This includes factors such as the length, width, and height of the cargo hold, which ultimately dictate the maximum size and configuration of packages that can be safely loaded and transported.

Understanding aircraft specifications is crucial for logistics and export professionals as it ensures compliance with safety regulations and operational efficacy. While other factors, like the value of the cargo, destination, and seasonal demand, can influence shipping practices and cost, they do not restrict the physical dimensions of the cargo package in the same fundamental way that an aircraft's dimensions do. Thus, the type of aircraft and its physical parameters are the key determinants in establishing the limits for cargo package sizes on scheduled airline shipments.