What is the ICAO code for Cape Girardeau, MO?

The ICAO code for Cape Girardeau, MO, is KCGI. The ICAO codes are four-letter alphanumeric designators assigned to each airport around the world and follow a specific structure. In the case of KCGI, the "K" prefix specifies that it is located in the United States. The subsequent letters "CGI" uniquely identify Cape Girardeau Regional Airport within that system. The other options do not conform to the established ICAO naming conventions or do not correspond to Cape Girardeau, MO, specifically, making KCGI the accurate representation of this airport's ICAO code.