Which entity is primarily responsible for evaluating the integration of AAM into airspace?

The correct answer focuses on NASA’s role in the evaluation and integration of Advanced Air Mobility (AAM) into airspace. NASA has been at the forefront of researching and developing technologies that support the advancement of aviation, specifically in relation to new aircraft systems and operational concepts like AAM. This includes conducting studies, simulations, and technology demonstrations that contribute to understanding how AAM can coexist with current aviation operations.

The agency's unique position and capabilities allow it to lead efforts in developing the necessary frameworks and technologies that ensure AAM can be safely integrated into the national airspace system. Additionally, NASA collaborates with a variety of stakeholders, including industry partners, government agencies, and academia, fostering a comprehensive approach to AAM development.

The other entities listed do play significant roles in aviation. The Federal Aviation Administration, for instance, primarily focuses on regulating and managing civil aviation safety and air traffic control. The U.S. Department of Transportation oversees national transportation policies, while NATO primarily deals with defense and military operations. However, these roles do not specifically center on the technological and operational integration of AAM into airspace to the extent that NASA's mandates focus on innovation and safety in aviation advancements.