Control tower in the context of "Dulles International Airport Main Terminal"

An air traffic controller (ATC) is a person responsible for the coordination of air traffic within controlled airspace. Typically they work in area control centers or control towers, where they monitor aircraft movements and maintain direct communication with the pilots.

The profession dates back to the early 20th century, evolving alongside advances in aviation and radar technology to meet the growing demands of air travel.

An aerodrome beacon, airport beacon, rotating beacon or aeronautical beacon is a beacon installed at an airport or aerodrome to indicate its location to aircraft pilots at night.

An aerodrome beacon is mounted on top of a towering structure, often a control tower, above other buildings of the airport. It produces flashes similar to that of a lighthouse.

An airport with a mandatory frequency (MF), mandatory traffic advisory frequency (MTAF) or air/ground radio (A/G) is an airport which does not have a control tower but still requires arriving and departing aircraft to communicate with other aircraft or a radio operator on a published frequency.

Mandatory frequency airports are rare in the United States, one example being Ketchikan International Airport (14 CFR 93.151), but they are common in other countries such as Canada, Australia, the United Kingdom and Norway; often, an MF or MTAF airport is one with scheduled passenger service but insufficient traffic to support a control tower. If there is a flight service specialist monitoring the frequency, the specialist will give pilots advisories about traffic, weather, and surface conditions, and may relay IFR clearances from en route controllers, but cannot give clearances themselves.

London Southend Airport (IATA: SEN, ICAO: EGMC) is an international airport situated on the outskirts of Southend-on-Sea in Essex, England, approximately 36 mi (58 km) from the centre of London. The airport straddles the boundaries between the city of Southend-on-Sea and the Rochford District.

Southend was the UK's third-busiest airport during the 1960s, behind Heathrow and Manchester, before passenger numbers dropped off in the 1970s. Following its purchase by Stobart Group in 2008, a development programme provided a new terminal and control tower, extended the runway, and opened Southend Airport railway station on the Shenfield-Southend line, which provides a connection to Central London via a regular rail service between London Liverpool Street and Southend Victoria.

Rocky Mountain Metropolitan Airport (IATA: BJC, ICAO: KBJC, FAA LID: BJC) is a public-use airport located in Broomfield, Colorado, United States. The airport is owned and operated by Jefferson County and is situated midway between Denver and Boulder on U.S. Highway 36. It is located 16 miles (26 km) northwest of the central business district of Denver, and is the closest airport to downtown Denver. The airport covers 1,700 acres (688 ha) and has three runways. Formerly known as Jefferson County Airport or Jeffco Airport, the airport was renamed Rocky Mountain Metropolitan Airport on October 10, 2006, although it is sometimes referred to as Rocky Mountain Regional Airport, e.g., on 2007–2012 county planning documents.

This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorizes it as a reliever airport. It is home to a large general aviation population including a fair amount of corporate traffic and several flight schools. The airport's proximity to the nearby Interlocken business district contributes to its business traveler clientele. It has a control tower on 118.6 (local) and 121.7 (ground) that is open from 0600 to 2200 local time. ATIS/AWOS broadcasts on 126.25. There are three runways—12/30 Left and Right and 3/21. The runway numbers were changed in November 2014 to reflect a change in magnetic variation. Two fixed-base operators (FBOs) offer fuel and other services.