Class B
E248068
Class B is a type of controlled airspace surrounding the busiest airports, designed to manage high volumes of air traffic with strict clearance and communication requirements.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Class B canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2248017 — 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 Context triple: [Class B airspace, hasAbbreviation, Class B]
-
A.
Class A
Class A is the original, high-priced share class of Berkshire Hathaway, known for its extremely high per-share price and long-term, value-investing shareholder base.
-
B.
Group B
Group B was one of the four-team preliminary round groups at UEFA Euro 2020, featuring national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
C.
Group B
Group B was one of the first-round pools in the 2018 FIFA World Cup, featuring four national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
D.
Group C
Group C was one of the first-round pools in the 2018 FIFA World Cup, featuring four national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
E.
Group C
Group C was one of the four-team preliminary round groups at UEFA Euro 2020, featuring national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
- 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 Target entity description: Class B is a type of controlled airspace surrounding the busiest airports, designed to manage high volumes of air traffic with strict clearance and communication requirements.
-
A.
Class A
Class A is the original, high-priced share class of Berkshire Hathaway, known for its extremely high per-share price and long-term, value-investing shareholder base.
-
B.
Group B
Group B was one of the four-team preliminary round groups at UEFA Euro 2020, featuring national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
C.
Group B
Group B was one of the first-round pools in the 2018 FIFA World Cup, featuring four national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
D.
Group C
Group C was one of the first-round pools in the 2018 FIFA World Cup, featuring four national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
-
E.
Group C
Group C was one of the four-team preliminary round groups at UEFA Euro 2020, featuring national teams competing in a round-robin format to qualify for the tournament’s knockout stage.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
airspace classification
ⓘ
controlled airspace ⓘ |
| appliesToJurisdiction |
United States of America
ⓘ
surface form:
United States
|
| contains | primary airport traffic area ⓘ |
| definedIn | 14 CFR Part 71 ⓘ |
| describedIn |
Aeronautical Information Manual
ⓘ
surface form:
FAA Aeronautical Information Manual
|
| designedFor |
busiest airports
ⓘ
high volumes of air traffic ⓘ |
| governingBody | Federal Aviation Administration ⓘ |
| hasAbbreviation | Class B self-linksurface differs ⓘ |
| hasCallSignPrefix | Class B associated primary airport identifier ⓘ |
| hasEntryRequirement |
ATC-assigned discrete transponder code
ⓘ
operable Mode C transponder ⓘ operable two-way radio ⓘ |
| hasLowerLimit | surface or specified altitude ⓘ |
| hasPurpose |
enhance safety around major airports
ⓘ
manage high-density air traffic ⓘ |
| hasRegulatoryStatus | positive control airspace for IFR and controlled for VFR ⓘ |
| hasShape | upside-down wedding cake ⓘ |
| hasSpeedLimit |
200 knots indicated airspeed in underlying airspace or VFR corridors
ⓘ
250 knots indicated airspeed below 10,000 feet MSL ⓘ |
| hasStructure | multiple layers ⓘ |
| hasTrafficSeparationProvidedBy | air traffic control ⓘ |
| hasTypicalExamples |
airspace around Chicago O'Hare International Airport
ⓘ
airspace around Hartsfield–Jackson Atlanta International Airport ⓘ airspace around Los Angeles International Airport ⓘ |
| hasUpperLimit | typically 10,000 feet MSL ⓘ |
| hasWeatherMinimums |
3 statute miles visibility
ⓘ
clear of clouds ⓘ |
| isAbove | Class C or Class D airspace in some configurations ⓘ |
| isDepictedOn |
Aeronautical Charts
ⓘ
surface form:
VFR sectional charts
terminal area charts ⓘ |
| isEstablishedBy | FAA rulemaking ⓘ |
| isLabeledAs | Class B on aeronautical charts ⓘ |
| isPartOf | National Airspace System ⓘ |
| isUsedBy |
air carriers
ⓘ
general aviation aircraft with clearance ⓘ large transport aircraft ⓘ |
| providesSeparationFor |
VFR aircraft from IFR aircraft
ⓘ
all IFR aircraft ⓘ |
| requires |
ATC clearance
ⓘ
Mode C transponder ⓘ continuous communication with ATC ⓘ two-way radio communication ⓘ |
| requiresForEntry | explicit ATC clearance ⓘ |
| requiresForStudentPilotEntry | specific instructor endorsement ⓘ |
| requiresForVFREntry | at least private pilot certificate or endorsement ⓘ |
| surrounds | primary Class B airport ⓘ |
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 Description of subject: Class B is a type of controlled airspace surrounding the busiest airports, designed to manage high volumes of air traffic with strict clearance and communication requirements.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Class B airspace