Which IATA code represents American Airlines?

The IATA code that represents American Airlines is indeed AA. IATA codes are unique two-letter identifiers assigned to airlines around the world, which are used for ticketing, baggage handling, and other purposes within the airline industry.

American Airlines, one of the largest airlines globally, uses AA as its IATA code, making it easily recognizable and associated with the airline's branding. The simplicity and distinctiveness of this code help in efficient communication and operations within the aviation sector.

In the context of the other choices, they correspond to different airlines. For example, UA stands for United Airlines, while YX is the code for Republic Airways, which operates regional flights under a different brand. DA does not correspond to a known major airline, adding further clarity as to why AA is the correct answer.