Class A airspace
E48727
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Class A airspace canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T383837 — 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 A airspace Context triple: [United States airspace, includes, Class A airspace]
-
A.
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.
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B.
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.
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C.
National Airspace System governance
National Airspace System governance is the overarching framework of policies, regulations, and oversight mechanisms that manage and coordinate the safe and efficient use of U.S. airspace by all civil and military aviation stakeholders.
-
D.
Air Navigation Commission
The Air Navigation Commission is a technical body within the International Civil Aviation Organization responsible for developing and recommending international standards and procedures for air navigation and aviation safety.
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E.
Washington Air Route Traffic Control Center
Washington Air Route Traffic Control Center is a Federal Aviation Administration facility responsible for managing and coordinating en route air traffic over a large portion of the mid-Atlantic region of the United States.
- 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 A airspace Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
National Airspace System governance
National Airspace System governance is the overarching framework of policies, regulations, and oversight mechanisms that manage and coordinate the safe and efficient use of U.S. airspace by all civil and military aviation stakeholders.
-
D.
Air Navigation Commission
The Air Navigation Commission is a technical body within the International Civil Aviation Organization responsible for developing and recommending international standards and procedures for air navigation and aviation safety.
-
E.
Washington Air Route Traffic Control Center
Washington Air Route Traffic Control Center is a Federal Aviation Administration facility responsible for managing and coordinating en route air traffic over a large portion of the mid-Atlantic region of the United States.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
airspace class
ⓘ
controlled airspace ⓘ |
| abbreviation | Class A ⓘ |
| altimeterSettingReference | standard pressure setting 29.92 inHg ⓘ |
| altitudeReference | flight levels ⓘ |
| appliesOver |
adjacent international waters within 12 NM of U.S. coast
ⓘ
contiguous United States ⓘ most of Alaska ⓘ |
| appliesTo | all aircraft operating within its vertical and lateral limits ⓘ |
| ATCServiceRequired | true ⓘ |
| chartDepiction |
described in IFR en route charts and regulations
ⓘ
not specifically depicted as Class A on VFR sectional charts ⓘ |
| classificationSystem |
National Airspace System
ⓘ
surface form:
U.S. National Airspace System
|
| clearanceRequired | IFR clearance required ⓘ |
| communicationRequirement | two-way radio communication with ATC ⓘ |
| controlledBy | Air Route Traffic Control Centers ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| entryRequirement | IFR flight plan ⓘ |
| flightLevelRange | FL180 to FL600 ⓘ |
| governingBody | Federal Aviation Administration ⓘ |
| IFRRequired | true ⓘ |
| includes |
airspace overlying Alaska within specified limits
ⓘ
airspace overlying coastal waters within 12 nautical miles of the U.S. coast ⓘ airspace overlying the contiguous United States ⓘ |
| introducedBy | Federal Aviation Administration ⓘ |
| lowerLimit | 18,000 feet MSL ⓘ |
| navigationRequirement | IFR-approved navigation equipment ⓘ |
| primaryRulesOfFlight | Instrument Flight Rules ⓘ |
| purpose |
provide positive control of high-altitude traffic
ⓘ
support efficient routing of high-performance aircraft ⓘ |
| regulatoryReference |
14 CFR Part 71
ⓘ
14 CFR Part 91 ⓘ |
| relatedConcept |
Class B airspace
ⓘ
Class C airspace ⓘ Class D airspace ⓘ Class E airspace ⓘ Class G airspace ⓘ |
| safetyFunction | separation of IFR aircraft ⓘ |
| surveillance | radar-based ATC separation ⓘ |
| SVFRPermitted | false ⓘ |
| transponderRequirement | Mode C or better transponder required ⓘ |
| typicalUsers |
air carrier aircraft
ⓘ
business jets ⓘ high-performance aircraft ⓘ |
| upperLimit | 60,000 feet MSL ⓘ |
| usage | en route high-altitude flight ⓘ |
| verticalExtent | from 18,000 feet MSL up to and including FL600 ⓘ |
| VFRPermitted | false ⓘ |
| weatherMinimums | IFR weather minimums apply ⓘ |
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 A airspace Description of subject: 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.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.