What equipment must a tug have when used for baggage operations?

The correct answer is the bag cart, which is essential equipment for a tug used in baggage operations. A bag cart is designed to transport multiple pieces of luggage efficiently from one location to another, such as between the terminal and the aircraft or between baggage claim areas. This equipment allows for better organization and handling of baggage, facilitating smooth operational flow during boarding and deplaning processes.

While other options may be used in various aviation contexts, they do not specifically serve the purpose of managing baggage operations as effectively as a bag cart does. The pallet loader is primarily used for loading and unloading cargo pallets, the tag line is a tool for guiding and securing loads but is not baggage-specific, and the ground power unit provides power to aircraft but is unrelated to the transportation of baggage itself.