The ICAO airport code or location indicator is a four-letter code assigning aerodromes around the globe. These codes are characterized by the International Civil Aviation Organization, and distributed in ICAO Document 7910: Location Indicators are utilized via airport regulation and aircraft operations, for example, flight arranging.

ICAO codes are likewise used to recognize other aeronautics offices, for example, climate stations, International Flight Service Stations or Area Control Centers, regardless of whether they are situated at airplane terminals. Flight data areas are likewise recognized by a one of a kind ICAO-code.

Greenville Downtown Airport (IATA: GMU, ICAO: KGMU, FAA LID: GMU) is three miles east of Greenville, in Greenville County, South Carolina. It is claimed by the Greenville Airport Commission. What's more, is the busiest general flight airplane terminal in South Carolina

The National Plan of Integrated Airport Systems for 2011–2015 sorted it as a general flying office.

GMU opened in 1928 as Greenville Municipal Airport. In 1930 it got its initially airmail flight. Amelia Earhart flew showing flights at GMU in an Autogiro for the Beech-Nut Company in November 1931. Eastern Airlines started booked flights in the late 1930s and Delta Airlines landed in 1945

Facilities

Greenville Downtown Airport covers 385 sections of land (156 ha) at a rise of 1,048 feet (319 m). It has two black-top runways: 1/19 is 5,393 by 100 feet (1,644 x 30 m) and 10/28 is 3,998 by 80 feet (1,219 x 24 m). It has two helipads, each solid 50 by 50 feet (15 x 15 m).

The Airport Commission as of late finished broad runway, runway, and cover upgrades, a noteworthy terminal remodel, and development of another street that made extra land accessible for improvement.