Flight: GATE4

Calculate passenger flight emissions with the ISO-certified GATE4 methodology by Advito, resolved per flight from carrier, flight number, route and departure date.

GATE4 is a carbon emissions calculation methodology developed by Advito for the travel sector, with a particular focus on flights. For flights, it accounts for aircraft type, passenger-to-freight ratios, carbon intensity and the effect of radiative forcing. The methodology is ISO-certified. Through the GATE4 Insights dashboard, it also gives travel managers insights into hotel stays, rail journeys and car rentals.

Sample requestsCopy Anchor Link

Send a quote while the traveller is still choosing a flight, then repeat the call with audit set to true once the booking is final. The body is otherwise identical.

{
  "expand": ["items"],
  "items": [{
    "audit": false,
    "type": "flight",
    "methodology": "GATE4",
    "origin": "NBO",
    "destination": "ABJ",
    "number_of_travelers": 1,
    "booking_class": "business",
    "airline": "2J",
    "flight_number": "2J520",
    "external_reference": "test",
    "departure_date": "2024-10-01"
  }]
}

DefaultsCopy Anchor Link

When a field is missing, SQUAKE fills it in before calculating.

Request fieldsCopy Anchor Link

How SQUAKE resolves the GATE4 recordCopy Anchor Link

GATE4 figures are flight-level: Advito publishes one record per operating carrier, flight number, route and departure date, and that record implies the aircraft configuration. SQUAKE resolves each flight in the following order, agreed with Advito, and stops at the first level that yields data:

1. exact: carrier, flight number, route and departure date all match.
2. flight_nearest_date: the same carrier and flight number on the route, on the closest available date. With a booking_class, SQUAKE prefers the closest date whose aircraft offers that cabin.
3. carrier_route_date: the average of the carrier's flights on the route on the departure date.
4. route_date: the average of all carriers' flights on the route on the departure date.
5. carrier_route_nearest_date: level 3 on the closest date with data.
6. route_nearest_date: level 4 on the closest date with data.

A flight number is never matched against another carrier. Without a departure_date, "closest date" is measured from the day of the request. When no level yields data, the flight fails with not_found.

SQUAKE keeps GATE4 records from 1 January 2019 onward. Up to July 2025 they're the historical figures Advito provided; from then on they're the monthly schedules Advito publishes, each kept as published closest to the departure date. A past departure therefore resolves at the level its record allows, most often exact.

Sample responseCopy Anchor Link

{
  "carbon_quantity": 1078043,
  "carbon_unit": "gram",
  "items": [{
    "carbon_quantity": 1078043,
    "carbon_unit": "gram",
    "external_reference": "test",
    "type": "flight",
    "methodology": "GATE4",
    "distance": 4700.0,
    "distance_unit": "kilometer",
    "algorithm_specifics": {
      "match_level": "exact",
      "matched_airline": "2J",
      "matched_flight_number": 520,
      "matched_departure_date": "2024-10-01",
      "matched_flights": 1,
      "booking_class_used": "business"
    }
  }]
}

Algorithm specificsCopy Anchor Link

The algorithm_specifics object in the response describes how the figure was resolved.

A routing item is resolved leg by leg, so these fields appear on each entry of legs (request expand: ["legs"]) rather than on the item itself.

BibliographyCopy Anchor Link

Accurately Measure Your Travel Emissions with GATE4. Advito, September 2024. advito.com/gate4