{
  "@context": [
    "https://schema.org",
    {
      "ec": "https://entitycodes.org/vocab#"
    }
  ],
  "@type": "DefinedTerm",
  "@id": "https://entitycodes.org/sic/4581/",
  "identifier": "4581",
  "name": "Airports, Flying Fields, and Airport Terminal Services",
  "description": "Standard Industrial Classification (SIC) code 4581: Airports, Flying Fields, and Airport Terminal Services.",
  "url": "https://entitycodes.org/sic/4581/",
  "inDefinedTermSet": {
    "@type": "DefinedTermSet",
    "name": "SIC 1987",
    "url": "https://entitycodes.org/sic/"
  },
  "sameAs": [
    "https://www.osha.gov/data/sic-manual"
  ],
  "additionalProperty": [
    {
      "@type": "PropertyValue",
      "name": "SIC division",
      "value": "Division E: Transportation, Communications, Electric, Gas, and Sanitary Services"
    },
    {
      "@type": "PropertyValue",
      "name": "SIC major group",
      "value": "Major Group 45: Transportation by Air"
    }
  ],
  "ec:crosswalk": [
    {
      "system": "NAICS 2022",
      "code": "488111",
      "title": "Air Traffic Control",
      "confidence": "chain",
      "via": "SIC1987:4581\u2192NAICS1997:488111\u21922002:488111\u21922007:488111\u21922012:488111\u21922017:488111\u21922022:488111",
      "url": "https://entitycodes.org/naics/488111/"
    },
    {
      "system": "NAICS 2022",
      "code": "238990",
      "title": "All Other Specialty Trade Contractors",
      "confidence": "chain",
      "via": "SIC1987:4581\u2192NAICS1997:56172\u21922002:238990\u21922007:238990\u21922012:238990\u21922017:238990\u21922022:238990",
      "url": "https://entitycodes.org/naics/238990/"
    },
    {
      "system": "NAICS 2022",
      "code": "561720",
      "title": "Janitorial Services",
      "confidence": "chain",
      "via": "SIC1987:4581\u2192NAICS1997:56172\u21922002:561720\u21922007:561720\u21922012:561720\u21922017:561720\u21922022:561720",
      "url": "https://entitycodes.org/naics/561720/"
    },
    {
      "system": "NAICS 2022",
      "code": "488119",
      "title": "Other Airport Operations",
      "confidence": "chain",
      "via": "SIC1987:4581\u2192NAICS1997:488119\u21922002:488119\u21922007:488119\u21922012:488119\u21922017:488119\u21922022:488119",
      "url": "https://entitycodes.org/naics/488119/"
    },
    {
      "system": "NAICS 2022",
      "code": "488190",
      "title": "Other Support Activities for Air Transportation",
      "confidence": "chain",
      "via": "SIC1987:4581\u2192NAICS1997:48819\u21922002:488190\u21922007:488190\u21922012:488190\u21922017:488190\u21922022:488190",
      "url": "https://entitycodes.org/naics/488190/"
    }
  ],
  "ec:provenance": {
    "definition": {
      "source": "US OSHA 1987 SIC Manual",
      "type": "US gov \u2014 public domain"
    },
    "crosswalk": {
      "source": "Census NAICS\u2194SIC concordance",
      "method": "transitive chain (NOT direct)"
    }
  },
  "license": "https://www.usa.gov/government-works",
  "dateModified": "2026-07-21",
  "isPartOf": {
    "@type": "DefinedTerm",
    "identifier": "Major Group 45: Transportation by Air",
    "name": "SIC Major Group Major Group 45: Transportation by Air",
    "@id": "https://entitycodes.org/sic/group/Major Group 45: Transportation by Air/"
  }
}