Which airport has the ICAO code KIAH?

The ICAO code KIAH corresponds to Houston Intercontinental Airport, which is a major international airport located in Houston, Texas. This airport is known for its wide range of domestic and international flights, serving as a hub for several major airlines. The "K" at the beginning of the ICAO code indicates that it is located in the United States, while the subsequent letters "IAH" are unique identifiers for Houston Intercontinental specifically.

In the context of this question, the other options refer to locations or facilities that do not align with the ICAO coding conventions specific to airports. Fort Smith is an airport but has a different ICAO code. The Graham VORTAC and Eaton VORTAC are navigational aids, not airports, and therefore do not have the ICAO code associated with them. This understanding of ICAO codes and their implications helps clarify the specific identity and functionality of KIAH as Houston Intercontinental Airport.