"seat-mile" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "seat",
        "3": "mile"
      },
      "expansion": "seat + mile",
      "name": "compound"
    }
  ],
  "etymology_text": "From seat + mile.",
  "forms": [
    {
      "form": "seat-miles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "seat-mile (plural seat-miles)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        {
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          "langcode": "en",
          "name": "Transport",
          "orig": "en:Transport",
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            "Fundamental"
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          "source": "w"
        },
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          "kind": "topical",
          "langcode": "en",
          "name": "Units of measure",
          "orig": "en:Units of measure",
          "parents": [
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            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A unit of measure of passenger carrying capacity, equal to the number of seats available multiplied by the number of miles flown."
      ],
      "id": "en-seat-mile-en-noun-T0bRGW6Q",
      "links": [
        [
          "transport",
          "transport"
        ]
      ],
      "raw_glosses": [
        "(transport) A unit of measure of passenger carrying capacity, equal to the number of seats available multiplied by the number of miles flown."
      ],
      "synonyms": [
        {
          "word": "seatmile"
        }
      ],
      "topics": [
        "transport"
      ]
    }
  ],
  "word": "seat-mile"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "seat",
        "3": "mile"
      },
      "expansion": "seat + mile",
      "name": "compound"
    }
  ],
  "etymology_text": "From seat + mile.",
  "forms": [
    {
      "form": "seat-miles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "seat-mile (plural seat-miles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "en:Transport",
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      ],
      "glosses": [
        "A unit of measure of passenger carrying capacity, equal to the number of seats available multiplied by the number of miles flown."
      ],
      "links": [
        [
          "transport",
          "transport"
        ]
      ],
      "raw_glosses": [
        "(transport) A unit of measure of passenger carrying capacity, equal to the number of seats available multiplied by the number of miles flown."
      ],
      "topics": [
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "seatmile"
    }
  ],
  "word": "seat-mile"
}