"5E" meaning in Conventions internationales

{
  "categories": [
    {
      "kind": "other",
      "name": "Symboles en conventions internationales",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Conventions internationales",
      "orig": "conventions internationales",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "glosses": [
        "* Code AITA de la compagnie d’aviation SGA Airlines (Siam General Aviation Company Limited, บริษัท สยาม เจนเนอรัล เอวิเอชั่น จำกัด)."
      ],
      "id": "fr-5E-conv-symbol-culzVgeT"
    }
  ],
  "word": "5E"
}

{
  "categories": [
    "Symboles en conventions internationales",
    "conventions internationales"
  ],
  "lang": "Conventions internationales",
  "lang_code": "conv",
  "pos": "symbol",
  "pos_title": "Symbole",
  "senses": [
    {
      "glosses": [
        "* Code AITA de la compagnie d’aviation SGA Airlines (Siam General Aviation Company Limited, บริษัท สยาม เจนเนอรัล เอวิเอชั่น จำกัด)."
      ]
    }
  ],
  "word": "5E"
}