Which airport code represents a major airport in Tennessee?

The airport code that represents a major airport in Tennessee is BNA, which stands for Nashville International Airport. Nashville is the largest city in Tennessee and serves as a central hub for domestic and some international flights. The airport plays a significant role in both commercial aviation and the economy of the region, making it a key transportation point.

The other codes correspond to airports located in different states; for instance, BKG is not a recognized major airport code, JAX refers to Jacksonville International Airport in Florida, and IAH represents George Bush Intercontinental Airport in Texas. Thus, BNA is the most suitable choice for identifying a major airport in Tennessee.