Class B (Washington area)
E418255
Class B (Washington area) is the controlled airspace surrounding the Washington, D.C. metropolitan area’s major airports, designed to manage high volumes of commercial air traffic and requiring specific clearances for entry.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Class B (Washington area) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4167553 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Class B (Washington area) Context triple: [KADW, isInAirspaceClass, Class B (Washington area)]
-
A.
Northwest Washington
Northwest Washington is a region in the northwestern part of the U.S. state of Washington, known for its agricultural communities, small towns, and proximity to the Canadian border and Puget Sound.
-
B.
Southwest Washington
Southwest Washington is a region of the U.S. state of Washington that encompasses the communities north of the Columbia River, including the Vancouver metropolitan area and surrounding counties.
-
C.
Western District of Washington
The Western District of Washington is a federal judicial district of the United States covering the western portion of Washington State, including major cities such as Seattle and Tacoma.
-
D.
Northwest Washington, D.C.
Northwest Washington, D.C. is a prominent quadrant of the U.S. capital known for its political landmarks, affluent residential areas, and major cultural and commercial centers.
-
E.
NS Washington District
NS Washington District is a Norfolk Southern Railway main line in Virginia that serves key locations including Manassas and connects the Washington, D.C. area to the broader rail network.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Class B (Washington area) Target entity description: Class B (Washington area) is the controlled airspace surrounding the Washington, D.C. metropolitan area’s major airports, designed to manage high volumes of commercial air traffic and requiring specific clearances for entry.
-
A.
Northwest Washington
Northwest Washington is a region in the northwestern part of the U.S. state of Washington, known for its agricultural communities, small towns, and proximity to the Canadian border and Puget Sound.
-
B.
Southwest Washington
Southwest Washington is a region of the U.S. state of Washington that encompasses the communities north of the Columbia River, including the Vancouver metropolitan area and surrounding counties.
-
C.
Western District of Washington
The Western District of Washington is a federal judicial district of the United States covering the western portion of Washington State, including major cities such as Seattle and Tacoma.
-
D.
Northwest Washington, D.C.
Northwest Washington, D.C. is a prominent quadrant of the U.S. capital known for its political landmarks, affluent residential areas, and major cultural and commercial centers.
-
E.
NS Washington District
NS Washington District is a Norfolk Southern Railway main line in Virginia that serves key locations including Manassas and connects the Washington, D.C. area to the broader rail network.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Class B airspace
ⓘ
controlled airspace ⓘ |
| airspaceClass | B ⓘ |
| altitudeEncodingRequirement | Mode C veil around primary airports ⓘ |
| appliesTo |
IFR aircraft
ⓘ
VFR aircraft ⓘ |
| associatedWith |
Baltimore/Washington International Thurgood Marshall Airport
ⓘ
surface form:
Baltimore–Washington International Airport Class B
Ronald Reagan Washington National Airport Class B ⓘ Washington Dulles International Airport Class B ⓘ |
| communicationRequirement | established two-way communication prior to entry ⓘ |
| contains |
IFR arrival and departure corridors
ⓘ
VFR transition routes ⓘ |
| coordinationWith |
Potomac TRACON
ⓘ
Washington Air Route Traffic Control Center ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedFor | jet transport category aircraft operations ⓘ |
| entryClearancePhraseology | cleared into the Bravo ⓘ |
| entryCondition |
aircraft must be equipped with required radios and transponder
ⓘ
pilot must receive explicit ATC clearance ⓘ |
| entryLimitation | student pilot restrictions under certain conditions ⓘ |
| governingRegulation | 14 CFR Part 71 ⓘ |
| locatedIn |
Washington metropolitan area
ⓘ
surface form:
Washington, D.C. metropolitan area
|
| mapDepiction |
sectional aeronautical charts
ⓘ
terminal area charts ⓘ |
| operationalEnvironment | highly structured ATC environment ⓘ |
| partOf | National Airspace System ⓘ |
| purpose |
enhance safety around major airports
ⓘ
manage high volumes of commercial air traffic ⓘ provide separation between IFR and VFR traffic ⓘ |
| regulatingAuthority | Federal Aviation Administration ⓘ |
| requires |
ATC clearance for entry
ⓘ
Mode C transponder ⓘ operable altitude-encoding equipment ⓘ two-way radio communication with ATC ⓘ |
| riskMitigation | reduces midair collision risk near major airports ⓘ |
| safetyFunction | protect arriving and departing traffic to major airports ⓘ |
| shape | upside-down wedding cake ⓘ |
| surrounds |
Baltimore/Washington International Thurgood Marshall Airport
ⓘ
surface form:
Baltimore–Washington International Thurgood Marshall Airport
Ronald Reagan Washington National Airport ⓘ Washington Dulles International Airport ⓘ |
| timeInEffect | continuous unless otherwise specified by NOTAM ⓘ |
| trafficType |
commercial air carrier traffic
ⓘ
general aviation traffic ⓘ high-density airline operations ⓘ |
| transponderRequirement | Mode C within and above Class B ⓘ |
| verticalStructure | multiple tiers ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Class B (Washington area) Description of subject: Class B (Washington area) is the controlled airspace surrounding the Washington, D.C. metropolitan area’s major airports, designed to manage high volumes of commercial air traffic and requiring specific clearances for entry.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.