{
 "publisher": "DroneLedger",
 "site": "https://droneincidents.com",
 "generated": "2026-10-16T20:05:34+00:00",
 "release": "20261016T200534828034-954bb7",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "DroneLedger (droneincidents.com)",
  "excludes": "Quoted source passages and linked articles remain the copyright of their publishers; they are included as short quotations for verification. Linked media and satellite images remain the rights holders' property; no image or video licence is granted by this dataset. Fonts (SIL OFL) and map data (Natural Earth, public domain) keep their own terms. City and region names in automatically published dossiers are checked against GeoNames (geonames.org, CC BY 4.0). Drone drawings and animations are schematic illustrations of a type, not evidence about any incident."
 },
 "assessmentNote": "DroneLedger assessment, not a finding. Editorial likelihood bands, not calibrated statistical confidence intervals. Unknown has no numeric probability. Outcomes are attributed reports; no totals or inference of intent from a hit.",
 "assessmentScale": {
  "version": "di-estimative-v1",
  "levels": {
   "almost_certain": {
    "low": 95,
    "high": 99
   },
   "very_likely": {
    "low": 80,
    "high": 95
   },
   "likely": {
    "low": 55,
    "high": 80
   },
   "roughly_even_chance": {
    "low": 45,
    "high": 55
   },
   "unlikely": {
    "low": 20,
    "high": 45
   },
   "very_unlikely": {
    "low": 5,
    "high": 20
   },
   "almost_no_chance": {
    "low": 1,
    "high": 5
   },
   "unknown": {
    "low": null,
    "high": null
   }
  }
 },
 "evidenceNote": "Each dossier separates three claims: drone presence, impact and attribution, each with its own evidence state and supporting sources. 'reported' means a source describes the claim without sufficient identification evidence; claims by parties to a conflict are never 'confirmed' on their own. Counts reflect dossiers in this curated archive, not all incidents worldwide. windowStart/windowEnd are reporting-window calendar bounds, not individual event days; legacy date remains the compatibility/sorting date for such records.",
 "locationNote": "lat/lon are the dossier's own approximate coordinates (see locationPrecision) and are empty when the incident location is unknown. referencePoint {lat, lon, level, name} is a display reference only: a fixed point in the named city (GeoNames), region (its administrative seat), sea or country (Natural Earth label point), derived at build time. It is not a geolocation, not an estimate of the incident location and may change when the dossier's place becomes more precise: reference point; incident location unknown.",
 "detailsNote": "media, operationalEffects, followUp and archiveEntity are editorial, source-indexed additions. Media is publisher-link only, has its own evidence status and never establishes drone presence or attribution. Debunked original-media links are removed; archived revisions omit media references. archivePattern is computed from mapped published event records at generated time, not a worldwide incident count. Null asOf means not established; publication time is not substituted.",
 "dataset": {
  "doi": "10.5281/zenodo.23345422",
  "url": "https://doi.org/10.5281/zenodo.23345422",
  "note": "Citable weekly snapshot (CSV + JSON) archived on Zenodo; this DOI always resolves to the latest version."
 },
 "howToCite": "Cite the dossier URL and revision, e.g. DroneLedger, “Drone report in Dnipropetrovsk region, Ukraine”, dossier auto-ua-2026-10-16-a50271dc46, revision 2, updated 2026-10-16. https://droneincidents.com/incident/auto-ua-2026-10-16-a50271dc46/",
 "incident": {
  "id": "delhi-airport-drone-like-object-2017-08-20",
  "title": "Drone-like object report disrupts Delhi airport operations",
  "place": "New Delhi",
  "country": "India",
  "countryCode": "IN",
  "date": "2017-08-20",
  "dateKind": "event",
  "scope": "single",
  "category": "airport",
  "droneStatus": "reported",
  "impactStatus": "confirmed",
  "attributionStatus": "none",
  "lat": 28.61,
  "lon": 77.21,
  "locationPrecision": "region",
  "summary": "A pilot reported an unidentified drone-like object near Delhi’s Indira Gandhi International Airport on 20 August 2017. Contemporary police, airline and air-traffic accounts describe precautionary flight restrictions and diversions; a later government answer disputes an airport-wide shutdown.",
  "impact": "Contemporary reports describe disrupted flights and diversions. A later parliamentary answer says only one runway was suspended while others continued operating. The exact extent and duration of the restrictions remain disputed.",
  "evidence": "Indian Express relays Delhi Police and AirAsia statements. The Times of India’s separate TNN report interviews an air-traffic official and Air India about disruption. AirAsia’s unidentified-object statement is shared, not independent drone identification. A later official parliamentary answer provides a conflicting account of the restriction’s extent.",
  "unknown": "No technical drone identification or operator established. Reports variously give about 40 minutes and 46 minutes and refer to an earlier separate scare that day. No exact closure duration, airport-wide shutdown or observation clock adopted. The parliamentary answer dated19December2017 concerns20August but contradicts contemporary all-runway accounts.",
  "attribution": "No operator established in the selected reporting.",
  "sources": [
   {
    "label": "Indian Express: Delhi Police and AirAsia statements",
    "url": "https://indianexpress.com/article/india/delhi-airport-live-igflight-operation-at-delhi-airport-halted-as-pilot-spots-drone-4805435/",
    "published": "2017-08-20",
    "family": "indian-express"
   },
   {
    "label": "Times of India / TNN: air traffic and Air India accounts",
    "url": "https://timesofindia.indiatimes.com/city/delhi/drone-sighting-hits-igi-flight-operations/articleshow/60149527.cms",
    "published": "2017-08-21",
    "family": "times-of-india"
   },
   {
    "label": "Rajya Sabha: civil aviation written answer338, printed page154",
    "url": "https://cms.rajyasabha.nic.in/UploadedFiles/Debates/OfficialDebatesDatewise/Floor/244/F19.12.2017.pdf",
    "published": "2017-12-19",
    "family": "india-parliament"
   }
  ],
  "timeline": [
   {
    "date": "2017-08-20",
    "text": "Unidentified-object report leads to precautionary restrictions and diversions; exact extent disputed.",
    "source": 0
   },
   {
    "date": "2017-12-19",
    "text": "Parliamentary answer disputes an airport-wide shutdown and describes a single-runway suspension.",
    "source": 2
   }
  ],
  "droneStatusSources": [
   0,
   1
  ],
  "impactStatusSources": [
   0,
   1
  ],
  "attributionSources": [],
  "droneTypes": [],
  "claims": [
   {
    "id": "unidentified-object",
    "axis": "drone",
    "statement": "AirAsia described an unidentified object rather than establishing drone identity.",
    "quote": "spotted unidentified object flying close to aircraft",
    "claimant": "AirAsia via Indian Express",
    "originId": "airasia-20170820",
    "relay": "relayed",
    "assessment": "supports",
    "note": "Short literal passage read on public source page; original evidence origins are distinguished in evidence.",
    "sourceIndex": 0,
    "quoteCheckedAt": "2026-10-16",
    "quoteTranslation": {}
   },
   {
    "id": "police-restriction",
    "axis": "impact",
    "statement": "Contemporary police account describes precautionary restrictions.",
    "quote": "operations at all the three runways were closed as a precautionary measure",
    "claimant": "Delhi Police via Indian Express",
    "originId": "delhi-police-20170820",
    "relay": "relayed",
    "assessment": "supports",
    "note": "Short literal passage read on public source page; original evidence origins are distinguished in evidence.",
    "sourceIndex": 0,
    "quoteCheckedAt": "2026-10-16",
    "quoteTranslation": {}
   },
   {
    "id": "airline-diversions",
    "axis": "impact",
    "statement": "Air India separately reported diverted services.",
    "quote": "Two of our flights to Delhi, including one on a wide body, had to be diverted.",
    "claimant": "Air India via Times of India",
    "originId": "airindia-20170820",
    "relay": "relayed",
    "assessment": "supports",
    "note": "Short literal passage read on public source page; original evidence origins are distinguished in evidence.",
    "sourceIndex": 1,
    "quoteCheckedAt": "2026-10-16",
    "quoteTranslation": {}
   }
  ],
  "review": "editor",
  "checkedAt": "2026-10-16",
  "autoCheckedAt": null,
  "updatedAt": "2026-10-16",
  "revision": 1,
  "series": [],
  "windowStart": null,
  "windowEnd": null,
  "windowBasis": null,
  "assessment": null,
  "outcome": [],
  "assessment_scale_version": null,
  "assessment_operator_subject": null,
  "assessment_operator_level": null,
  "assessment_operator_range_low": null,
  "assessment_operator_range_high": null,
  "assessment_target_subject": null,
  "assessment_target_level": null,
  "assessment_target_range_low": null,
  "assessment_target_range_high": null,
  "assessment_droneType_subject": null,
  "assessment_droneType_level": null,
  "assessment_droneType_range_low": null,
  "assessment_droneType_range_high": null,
  "media": [],
  "operationalEffects": [],
  "followUp": [],
  "archiveEntity": {
   "key": "indira-gandhi-international-airport",
   "kind": "airport",
   "label": "Indira Gandhi International Airport",
   "sourceIndex": 0
  },
  "namedLocation": null,
  "publisherMedia": [],
  "reportTiming": null,
  "archivePattern": {
   "asOf": "2026-10-16T20:05:34+00:00",
   "entityKey": "indira-gandhi-international-airport",
   "windows": [
    {
     "days": 30,
     "records": []
    },
    {
     "days": 90,
     "records": []
    }
   ],
   "note": "Only published archive records with an editorial entity mapping; unassigned records excluded. Not all real-world incidents or a common cause. No same-day matching."
  },
  "impactReports": [],
  "corroboration": "curated",
  "interceptionReported": {
   "evidenceState": "reported",
   "note": "Official aggregate claims, not independently verified kills. Parts are included only when explicitly sourced and sum to the reported total. Catalogue countermeasures are not incident evidence.",
   "counts": []
  },
  "referencePoint": null,
  "labels": {
   "category": "Airport disruption",
   "droneStatus": "Reported",
   "impactStatus": "Confirmed",
   "attributionStatus": "Not established"
  },
  "url": "https://droneincidents.com/incident/delhi-airport-drone-like-object-2017-08-20/",
  "citation": "DroneLedger, “Drone-like object report disrupts Delhi airport operations”, dossier delhi-airport-drone-like-object-2017-08-20, revision 1, updated 2026-10-16. https://droneincidents.com/incident/delhi-airport-drone-like-object-2017-08-20/",
  "history": [
   {
    "revision": 1,
    "date": "2026-10-16",
    "at": "2026-10-16T18:32:19.865+00:00",
    "note": "Curated dossier created after checking the cited sources line by line."
   }
  ]
 }
}