{
  "FlightLeg": {
    "origin_iata": "string",
    "destination_iata": "string",
    "departure_time": "optional ISO-8601 datetime",
    "marketing_carrier": "optional string",
    "operating_carrier": "optional string",
    "flight_number": "optional string"
  },
  "FlightRequest": {
    "legs": ["FlightLeg"],
    "cabin_class": "economy | premium_economy | business | first | unknown",
    "passengers": "integer >= 1",
    "roundtrip": "boolean",
    "include_non_co2": "boolean",
    "currency": "optional ISO 4217 code"
  },
  "EmissionEstimate": {
    "co2_kg": "number or null",
    "co2e_kg": "number or null",
    "non_co2_multiplier": "number or null",
    "breakdown": {
      "ch4_kg": "number or null",
      "n2o_kg": "number or null"
    },
    "methodology": {
      "method_name": "string or null",
      "method_version": "string or null",
      "dataset_version": "string or null",
      "vendor": "string or null",
      "standard": "string or null",
      "documentation_url": "string or null"
    },
    "vendor_raw": "opaque vendor-specific JSON/XML"
  },
  "AirportSearchRequest": {
    "query": "string",
    "limit": "optional integer",
    "country_filter": "optional ISO 3166 code",
    "languages": ["optional ISO 639 code"]
  },
  "AirportInfo": {
    "iata_code": "string",
    "icao_code": "string",
    "name": "string",
    "localized_name": ["LocalizedString"],
    "country": "ISO 3166 code",
    "continent": "string",
    "latitude": "double",
    "longitude": "double"
  },
  "LocalizedString": {
    "lang": "ISO 639 code",
    "name": "string"
  }
}

{
  "FlightCalculationRequest": {
    "api_key": "optional string",
    "provider": "optional string",
    "operation": "optional string",
    "departure_date": "optional ISO-8601 date",
    "rfi": "optional number",
    "price_per_ton": "optional number",
    "currency": "optional ISO 4217 code",
    "roundtrip": "optional boolean",
    "passengers": "optional integer >= 1",
    "cabin_class": "economy | premium_economy | business | first | unknown",
    "calculation_method": "optional string",
    "reference": "optional string",
    "legs": ["FlightLeg"],
    "iata_path": ["string"],
    "currencies": ["optional ISO 4217 code"],
    "vendor_options": "object"
  },
  "FlightLeg": {
    "id": "optional string",
    "index": "optional integer",
    "origin_iata": "optional string",
    "destination_iata": "optional string",
    "origin": "optional LocationRef",
    "destination": "optional LocationRef",
    "departure_date": "optional ISO-8601 date",
    "departure_time": "optional ISO-8601 datetime",
    "flight_number": "optional string",
    "marketing_carrier": "optional string",
    "operating_carrier": "optional string",
    "airline": "optional string",
    "aircraft_type": "optional string",
    "passenger_count": "optional integer",
    "flight_count": "optional integer",
    "travel_class": "optional string",
    "charter": "optional boolean",
    "via": ["optional string"],
    "distance_km": "optional number",
    "vendor_options": "object"
  },
  "EmissionCalculationResult": {
    "provider": "string",
    "domain": "string",
    "operation": "string",
    "status": "string",
    "total": "EmissionAmount",
    "per_passenger": "EmissionAmount",
    "distance": "DistanceAmount",
    "per_passenger_distance": "DistanceAmount",
    "fuel": "FuelAmount",
    "offset": "MoneyAmount",
    "per_passenger_price": "MoneyAmount",
    "quote": "QuoteInfo",
    "methodology": "MethodologyMeta",
    "passenger_count": "integer or null",
    "travel_class": "string or null",
    "description": "string or null",
    "segments": ["SegmentEmissionResult"],
    "prices": ["MoneyAmount"],
    "errors": ["ProviderError"],
    "metadata": "opaque object or array",
    "input_echo": "opaque object",
    "vendor_raw": "opaque object"
  },
  "SegmentEmissionResult": {
    "id": "string or null",
    "index": "integer or null",
    "type": "string or null",
    "status": "string or null",
    "origin": "LocationRef",
    "destination": "LocationRef",
    "flight_number": "string or null",
    "flight_date": "ISO-8601 date or null",
    "airline": "string or null",
    "aircraft_type": "string or null",
    "passenger_count": "integer or null",
    "flight_count": "integer or null",
    "travel_class": "string or null",
    "charter": "boolean or null",
    "emissions": "EmissionAmount",
    "class_emissions": "CabinClassEmissionSet",
    "distance": "DistanceAmount",
    "fuel": "FuelAmount",
    "offset": "MoneyAmount",
    "cruise_altitude": "number or null",
    "distance_in_critical_altitudes": "number or null",
    "source": "string or null",
    "errors": ["ProviderError"],
    "vendor_raw": "opaque object"
  },
  "EmissionAmount": {
    "co2_kg": "number or null",
    "co2e_kg": "number or null",
    "co2e_tonnes": "number or null",
    "wtw_kg": "number or null",
    "ttw_kg": "number or null",
    "wtt_kg": "number or null",
    "non_co2_multiplier": "number or null",
    "unit": "kg | tonnes | grams | null",
    "per": "request | passenger | segment | null"
  },
  "CabinClassEmissionSet": {
    "economy_kg": "number or null",
    "premium_economy_kg": "number or null",
    "business_kg": "number or null",
    "first_kg": "number or null"
  },
  "DistanceAmount": {
    "value": "number or null",
    "unit": "km | miles | null",
    "miles": "number or null"
  },
  "FuelAmount": {
    "liters": "number or null",
    "kg": "number or null"
  },
  "MoneyAmount": {
    "amount": "number or null",
    "amount_minor": "integer or null",
    "currency": "ISO 4217 code or null",
    "url": "string or null",
    "locale": "string or null"
  },
  "QuoteInfo": {
    "id": "string or null",
    "expires_at": "ISO-8601 datetime or null"
  },
  "MethodologyMeta": {
    "method_name": "string or null",
    "method_version": "string or null",
    "dataset_version": "string or null",
    "vendor": "string or null",
    "standard": "string or null",
    "documentation_url": "string or null",
    "non_co2_treatment": "none | included | partial | unknown"
  },
  "ProviderError": {
    "code": "string or null",
    "message": "string",
    "field": "string or null",
    "vendor_raw": "opaque object"
  },
  "LocationRef": {
    "iata": "string or null",
    "icao": "string or null",
    "name": "string or null",
    "city": "string or null",
    "country": "ISO 3166 code or null",
    "continent": "string or null",
    "lat": "number or null",
    "lon": "number or null",
    "coord": "string or null"
  },
  "AirportSearchRequest": {
    "query": "string",
    "limit": "optional integer",
    "country_filter": "optional ISO 3166 code",
    "languages": ["optional ISO 639 code"]
  },
  "AirportInfo": {
    "iata_code": "string",
    "icao_code": "string",
    "name": "string",
    "localized_name": ["LocalizedString"],
    "country": "ISO 3166 code",
    "continent": "string",
    "latitude": "double",
    "longitude": "double"
  },
  "LocalizedString": {
    "lang": "ISO 639 code",
    "name": "string"
  }
}