Class B airspace
E49550
Class B airspace is a highly controlled airspace surrounding the nation’s busiest airports, designed to manage dense traffic with strict entry and communication requirements for pilots.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Class B airspace canonical | 5 |
| Class B airspace around Washington, D.C. | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T383838 — 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 airspace Context triple: [United States airspace, includes, Class B airspace]
-
A.
Class A airspace
Class A airspace is the highest controlled airspace layer in the United States, typically used for high-altitude en route flight under instrument flight rules (IFR) by commercial and other high-performance aircraft.
-
B.
National Airspace System
The National Airspace System is the integrated network of U.S. airspace, air traffic control facilities, navigation aids, airports, and regulations that enables the safe and efficient operation of civil and military aviation.
-
C.
United States airspace
United States airspace is the controlled portion of the atmosphere above U.S. territory and territorial waters where U.S. authorities regulate and manage all civil and military aviation activities.
-
D.
Air Traffic Control Centre
The Air Traffic Control Centre is a Belgian Air Force unit responsible for managing and coordinating military air traffic within Belgian airspace.
-
E.
BAA
BAA is the acronym for the Basketball Association of America, the professional basketball league that later merged to form today’s National Basketball Association (NBA).
- 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 airspace Target entity description: Class B airspace is a highly controlled airspace surrounding the nation’s busiest airports, designed to manage dense traffic with strict entry and communication requirements for pilots.
-
A.
Class A airspace
Class A airspace is the highest controlled airspace layer in the United States, typically used for high-altitude en route flight under instrument flight rules (IFR) by commercial and other high-performance aircraft.
-
B.
National Airspace System
The National Airspace System is the integrated network of U.S. airspace, air traffic control facilities, navigation aids, airports, and regulations that enables the safe and efficient operation of civil and military aviation.
-
C.
United States airspace
United States airspace is the controlled portion of the atmosphere above U.S. territory and territorial waters where U.S. authorities regulate and manage all civil and military aviation activities.
-
D.
Air Traffic Control Centre
The Air Traffic Control Centre is a Belgian Air Force unit responsible for managing and coordinating military air traffic within Belgian airspace.
-
E.
BAA
BAA is the acronym for the Basketball Association of America, the professional basketball league that later merged to form today’s National Basketball Association (NBA).
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
United States airspace class
ⓘ
controlled airspace classification ⓘ |
| allows |
IFR operations
ⓘ
VFR operations with ATC clearance ⓘ |
| associatedWith |
Class B primary airport control tower
ⓘ
radar approach control facility ⓘ |
| centeredOn | primary Class B airport ⓘ |
| chartedOn |
VFR terminal area charts
ⓘ
sectional aeronautical charts ⓘ |
| composedOf | multiple concentric shelves ⓘ |
| definedBy | Federal Aviation Administration ⓘ |
| designedFor |
high‑performance aircraft
ⓘ
large air carrier operations ⓘ |
| existsIn |
National Airspace System
ⓘ
surface form:
National Airspace System of the United States
|
| governedBy |
Title 14 of the Code of Federal Regulations
ⓘ
surface form:
Title 14 CFR Part 71
Federal Aviation Regulations ⓘ
surface form:
Title 14 CFR Part 91
|
| hasAbbreviation | Class B ⓘ |
| hasCeiling | varies by airport ⓘ |
| hasEntryRequirement | aircraft must be equipped for IFR or VFR with required radios and transponder ⓘ |
| hasLowerFloor | varies by sector ⓘ |
| hasMinimumWeatherRequirements |
3 statute miles visibility
ⓘ
clear of clouds ⓘ |
| hasNoiseConsiderations | often subject to noise abatement procedures ⓘ |
| hasPrimaryPurpose | management of high‑density air traffic ⓘ |
| hasShape | upside‑down wedding cake ⓘ |
| hasSpecialVFRRules | Special VFR operations require at least instrument rating for pilots at some Class B airports ⓘ |
| hasSpeedLimit |
200 knots indicated airspeed in underlying VFR corridors or within 4 NM of primary airport at or below 2,500 feet AGL
ⓘ
250 knots indicated airspeed below 10,000 feet MSL ⓘ |
| hasTypicalLowerLimit | surface at primary airport ⓘ |
| hasTypicalUpperLimit | 10,000 feet MSL ⓘ |
| hasVerticalLimit | surface to typically 10,000 feet MSL ⓘ |
| isLessRestrictiveThan | Class A airspace ⓘ |
| isMoreRestrictiveThan |
Class C airspace
ⓘ
Class D airspace ⓘ |
| protects | arrival and departure corridors ⓘ |
| provides |
sequencing for all aircraft to primary airport
ⓘ
traffic separation between IFR and VFR aircraft ⓘ |
| relatedTo | ICAO Class C and D concepts but defined differently in the U.S. system ⓘ |
| requires |
ATC clearance prior to entry
ⓘ
Mode C transponder ⓘ operable altitude‑encoding equipment ⓘ pilot to receive explicit ATC authorization ⓘ student pilot endorsement for solo operations ⓘ two‑way radio communication with ATC ⓘ |
| requiresForEntry | pilot to establish two‑way communication using correct facility call sign ⓘ |
| requiresForVFR | ATC separation services from other aircraft ⓘ |
| subjectTo | local letters of agreement and facility directives ⓘ |
| surrounds | nation’s busiest airports ⓘ |
| uses | solid blue lines on charts ⓘ |
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 airspace Description of subject: Class B airspace is a highly controlled airspace surrounding the nation’s busiest airports, designed to manage dense traffic with strict entry and communication requirements for pilots.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Class B airspace around Washington, D.C.