Class E airspace
E257059
Class E airspace is a category of controlled airspace that typically begins at various altitudes above the surface and extends up to but not including Class A airspace, where IFR and many VFR operations are managed under air traffic control.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Class E airspace canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2229367 — 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 E airspace Context triple: [Class A airspace, relatedConcept, Class E 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.
Class D airspace
Class D airspace is a category of controlled airspace surrounding smaller airports with an operational control tower, where pilots must establish two-way radio communication with air traffic control before entering.
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C.
Class C airspace
Class C airspace is a category of controlled airspace around busy airports that requires two-way radio communication and air traffic control clearance for participating aircraft.
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D.
Class G airspace
Class G airspace is uncontrolled airspace where air traffic control does not provide separation services, and pilots operate primarily under visual flight rules with minimal regulatory requirements.
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E.
Class B airspace
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.
- 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 E airspace Target entity description: Class E airspace is a category of controlled airspace that typically begins at various altitudes above the surface and extends up to but not including Class A airspace, where IFR and many VFR operations are managed under air traffic control.
-
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.
Class D airspace
Class D airspace is a category of controlled airspace surrounding smaller airports with an operational control tower, where pilots must establish two-way radio communication with air traffic control before entering.
-
C.
Class C airspace
Class C airspace is a category of controlled airspace around busy airports that requires two-way radio communication and air traffic control clearance for participating aircraft.
-
D.
Class G airspace
Class G airspace is uncontrolled airspace where air traffic control does not provide separation services, and pilots operate primarily under visual flight rules with minimal regulatory requirements.
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E.
Class B airspace
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.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
airspace classification
ⓘ
controlled airspace ⓘ |
| appliesTo |
controlled airspace not designated as Class A
ⓘ
controlled airspace not designated as Class B ⓘ controlled airspace not designated as Class C ⓘ controlled airspace not designated as Class D ⓘ |
| chartedOn |
IFR en route charts
ⓘ
sectional aeronautical charts ⓘ |
| contains |
en route domestic airspace
ⓘ
federal airways ⓘ offshore airspace areas ⓘ surface areas designated for an airport ⓘ transition areas ⓘ |
| definedIn | 14 CFR Part 71 (United States) ⓘ |
| doesNotRequire | ATC clearance for VFR operations ⓘ |
| existsIn | many ICAO contracting states ⓘ |
| extendsUpTo | but not including Class A airspace ⓘ |
| governedBy |
IFR separation standards
ⓘ
VFR weather minimums ⓘ |
| isDifferentFrom |
Class B airspace
ⓘ
Class C airspace ⓘ Class D airspace ⓘ Class G airspace (uncontrolled) ⓘ |
| lowerLimitCanBe |
1200 feet above ground level
ⓘ
700 feet above ground level ⓘ other specified altitudes ⓘ surface ⓘ |
| lowerLimitVariesBy |
airspace design
ⓘ
geographic area ⓘ |
| mayProvideATCServiceTo | VFR aircraft on request ⓘ |
| partOf | National Airspace System ⓘ |
| providesATCServiceTo | IFR aircraft ⓘ |
| purpose |
to protect instrument approach and departure paths
ⓘ
to provide controlled airspace for IFR operations ⓘ to support en route air traffic control services ⓘ |
| regulatedBy |
Federal Aviation Administration
ⓘ
International Civil Aviation Organization ⓘ |
| requires | ATC clearance for IFR operations ⓘ |
| requiresForIFR | pilot instrument rating or equivalent authorization ⓘ |
| symbolizedBy |
dashed magenta lines for surface areas
ⓘ
shaded blue on sectional charts for 1200-foot floors ⓘ shaded magenta on sectional charts for 700-foot floors ⓘ |
| upperLimit | flight level 600 ⓘ |
| usedIn |
instrument flight rules operations
ⓘ
visual flight rules operations ⓘ |
| weatherMinimumsVFRBelow10000MSL |
1000 feet above clouds
ⓘ
2000 feet horizontal from clouds ⓘ 3 statute miles visibility ⓘ 500 feet below clouds ⓘ |
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 E airspace Description of subject: Class E airspace is a category of controlled airspace that typically begins at various altitudes above the surface and extends up to but not including Class A airspace, where IFR and many VFR operations are managed under air traffic control.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.