Which airport is located in Fayetteville, Arkansas?

The Northwest Arkansas National Airport, also known as XNA, is the correct answer because it is specifically situated in Fayetteville, Arkansas. This airport serves the northwestern region of Arkansas, and its location is critical for providing access to both domestic and limited international flights for residents and visitors of Fayetteville and the surrounding areas.

In contrast, the other airports mentioned, such as Louisville Muhammad Ali International Airport, San Antonio International Airport, and Richmond International Airport, are located in entirely different states and are not related to Fayetteville, Arkansas. Each of these alternatives serves their respective regions and does not have a geographic connection to Fayetteville, further affirming that Northwest Arkansas National Airport is the only relevant option in this context.