Lois Larson
Blue airports are those with control towers operating under Class B, Class C, or Class D airspace. Airports with control towers that fall under Class B, Class C, or Class D airspace are depicted in blue on Sectional Aeronautical Charts. This classification system helps pilots understand air traffic control levels at different airports. Blue airports have a higher level of air traffic control due to their proximity to busy airspaces.
| Characteristics | Values |
|---|---|
| Airspace classification | Class B, Class C, and Class D |
| Air traffic control level | Higher level of air traffic control |
| Proximity to busy airspaces | Yes |
| Control tower | Yes |
| Shape | Upside-down cake |
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What You'll Learn
- Blue airports are those with control towers
- They are located in or beneath Class B, Class C, or Class D airspace
- Blue airports have a higher level of air traffic control
- They are depicted on aeronautical charts with solid blue lines
- Examples include Los Angeles International Airport and Phoenix Sky Harbor International Airport
Blue airports are those with control towers
Blue airports refer to airports depicted in blue on Sectional Aeronautical Charts. These are airports with control towers that are located in or beneath Class B, Class C, or Class D airspace. This means that these airports have a higher level of air traffic control due to their proximity to busy airspaces.
Sectional Aeronautical Charts are used by pilots to understand the level of control and airspace classification as part of flight planning. The charts use colours and symbols to indicate different types of airports and their locations relative to controlled airspace. Drone pilots, for example, can use these charts to determine which radio frequency to monitor for air traffic updates for particular airports.
The geometry of Class B airspace varies from airport to airport but typically forms an "upside-down cake" shape, with the widest layers at the highest altitudes. Each Class B airspace is custom-made for the airport it surrounds. On a sectional chart, Class B airspace is depicted with solid blue lines. Each sector has an altitude block with a floor and ceiling. The inner sector of Class B airspace starts at the airport surface and extends up to around 10,000 feet MSL.
Class C airspace is for large airports that are less busy than Class B airports. It is found around most medium-sized to large cities. On a sectional chart, it is depicted with magenta lines instead of blue. The inner core extends from the airport surface to around 4,000 feet AGL with a radius of 5 nautical miles.
Class D airspace is for airports that are busy enough to have a control tower but not as busy as Class C airspace. On a sectional chart, it is depicted with dashed blue lines. The number in the box indicates the ceiling in hundreds of feet MSL. Class D airspace starts from the airport surface and extends to about 2,500 feet AGL or the airspace floor above it.
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They are located in or beneath Class B, Class C, or Class D airspace
Blue airports are those with control towers that are located in or beneath Class B, Class C, or Class D airspace. This means that these airports have a higher level of air traffic control due to their proximity to busy airspaces.
Class B airports are those with the busiest air traffic in the country. The airspace around these airports is classified as ICAO Class B, and the primary airport (one or more) for which this airspace is designated is called a Class B airport. The geometry of Class B airspace varies from one airport to the next but they typically form an "upside-down cake" shape where the widest layers are at the highest altitudes. Each Class B airspace is custom-made for the airport it surrounds.
Class C airports exist at large airports that are less busy than Class B airports. They are usually found around most medium-sized to large cities. On the sectional chart, Class C airspace looks similar to Class B airspace, but it's smaller. It also has magenta lines instead of blue.
Class D airports are for airports that are busy enough to have a control tower but not as busy as Class C airports. It is generally airspace from the surface to 2,500 feet above the airport elevation (charted in MSL) surrounding airports with an operational control tower.
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Blue airports have a higher level of air traffic control
Blue airports refer to airports depicted in blue on Sectional Aeronautical Charts. These are airports with control towers operating under Class B, Class C, or Class D airspace. Blue airports have a higher level of air traffic control due to their proximity to busy airspaces. Examples of blue airports include major airports like Los Angeles International Airport, which operates in Class B airspace.
Class B airspace is found around the nation's busiest airports in major cities. As of January 2023, there were 37 Class B airports in the United States. Each Class B airspace is custom-made for the airport it surrounds, and it can be visualized in 3D as an upside-down wedding cake due to its multiple tiers of different altitudes and shapes. The inner sector of Class B airspace starts at the airport surface and extends up to around 10,000 feet MSL, while sectors further out will have higher bases, allowing traffic to fly underneath.
Class C airspace is similar to Class B but smaller, and it is depicted with magenta lines on charts instead of blue. It extends from the airport surface to around 4,000 feet AGL with a 5-nautical-mile radius. Traffic separation is less tightly controlled in Class C compared to Class B, and aircraft must maintain greater distances from clouds. The speed limit within a 4-nautical-mile radius of the airport is 200 knots, while the standard limit below 10,000 feet MSL is 250 knots.
Class D airspace is depicted with dashed blue lines on charts. It resembles a cylinder with a radius of about 4 to 5 nautical miles and extends from the airport surface to about 2,500 feet AGL or the airspace floor above it. The speed limit in Class D airspace is 200 knots due to its small size and proximity to the airport. Two-way radio communication with the tower is required before entering Class D airspace, and these control towers often close at night when traffic is slow.
In summary, blue airports are those with control towers located in or beneath Class B, C, or D airspace. These airports experience a higher level of air traffic control due to their proximity to busy airspaces and the associated complexities of air traffic management.
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They are depicted on aeronautical charts with solid blue lines
Blue airports are depicted on aeronautical charts using solid blue lines. These blue airports are airports with control towers operating under Class B, Class C, and Class D airspace. The blue lines indicate the boundaries of the airspace surrounding the airport. Each sector has an altitude block with a floor and ceiling, depicted on the chart in hundreds of feet MSL with a line in between. The inner sector of Class B airspace, for example, starts at the airport surface and extends up to around 10,000 feet MSL. The geometry of Class B airspace varies, but it typically forms an "upside-down cake" shape, with the widest layers at the highest altitudes. The innermost area is aligned with the airport's runway and has a designated altitude base and ceiling.
The aeronautical charts are essential tools for drone pilots, helping them understand airspace hazards, topography, airport data, and controlled airspace. Being able to interpret these charts is a crucial skill for obtaining a remote pilot certificate. The charts use specific symbols to represent different types of airports and their locations relative to controlled airspace. For instance, airports with control towers are represented by blue symbols, while airports without control towers are depicted using magenta symbols.
The blue airports, with their control towers and proximity to busy airspaces, have a higher level of air traffic control. The blue colour on the aeronautical charts signifies the airport's location within or beneath Class B, C, or D airspace. This colour distinction is standardised in aviation regulations, enabling pilots to easily interpret the level of control and airspace classification during flight planning.
Additionally, the charts provide information about the nature of the airspace, such as controlled, uncontrolled, or special-use airspace. Controlled airspace refers to the area where air traffic control (ATC) services are provided, typically the airspace immediately surrounding any airport. Drone flight in controlled airspace is usually restricted due to high air traffic volume, but certain provisions allow it under specific conditions.
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Examples include Los Angeles International Airport and Phoenix Sky Harbor International Airport
Los Angeles International Airport (LAX) is the primary international airport serving Los Angeles and its surrounding metropolitan area, in the U.S. state of California. LAX is located in the Westchester neighbourhood of the city of Los Angeles, 18 miles (29 km; 16 nmi) southwest of downtown Los Angeles. It is the largest and busiest international airport on the West Coast of the United States, serving as a major international gateway to the country. LAX is the closest airport to the Westside and the South Bay, and it is operated by Los Angeles World Airports (LAWA), a branch of the Los Angeles city government. The airport covers 3,500 acres (1,400 ha) of land and has four parallel runways. In 2023, LAX handled 75,050,875 passengers, making it the world's eighth-busiest airport. The following year, in 2024, it served 76,587,980 passengers, a 2.04% increase from 2023. LAX offers 645 daily commercial flights to 162 destinations and 1,890 weekly international flights to 68 global destinations.
Phoenix Sky Harbor International Airport (PHX) is another example of a large and busy airport. It offers convenient services such as pre-bookable parking and lounges with complimentary food and drinks, a full-service bar, and free Wi-Fi.
Airports are classified based on the airspace around them and their level of traffic. The airspace around the busiest US airports is classified as ICAO Class B, and these airports are referred to as Class B airports. As of January 2023, there were 37 Class B airports in the United States.
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Frequently asked questions
Blue is used to represent airports with control towers in Class B, Class C, and Class D airspace.
Class B airspace is considered the busiest, with Class C being less busy and Class D being less busy still.
Class B airspace is often described as looking like an upside-down wedding cake, with the widest layers at the highest altitudes.
A blue airport is one with a control tower in Class B, C, or D airspace. An example of a blue airport is Los Angeles International Airport, which operates in Class B airspace.
