message: Fix carrier mappings to match the data loaded from the XLS file
diff: "level_1": "Freighting goods",
  "level_2": "Freight flights",
  "level_3": "Long-haul, to/from UK",
  - "level_4": "Average",
  + "level_4": "",
  "text": "With RF",
  "activity_uom": "tonne.km"
  },
  "level_1": "Freighting goods",
  "level_2": "Freight flights",
  "level_3": "Long-haul, to/from UK",
  - "level_4": "Average",
  + "level_4": "",
  "text": "With RF",
  "activity_uom": "tonne.km"
  }
  