In which airspace can a sport pilot NOT operate without additional training?

A sport pilot cannot operate in Class B airspace without additional training due to the specific operational requirements and complexities associated with this type of airspace. Class B airspace is established around major airports to manage high-density traffic; it typically requires pilots to have a higher level of training in navigation, communication procedures, and traffic separation.

This additional training ensures that the pilot understands how to operate safely within this busy environment, which includes requirements for communication with Air Traffic Control (ATC) and adhering to specific entry and exit procedures.

In contrast, the other airspace classes, such as Class G, E, and D, have lower barriers for entry and do not require the same level of specialized training for sport pilots. Class G is uncontrolled airspace, while Class E and D have standard operational protocols that can be managed with a sport pilot's training.