“Aerodrome” means a defined area on land or water, including any buildings, installations and equipment, intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft;

“Aerodrome pair” means a group of two aerodromes composed of a departing aerodrome and an arrival aerodrome;

“Aeroplane” means a power-driven heavier-than-air aircraft, deriving its lift in flight chiefly from aerodynamic reactions on surfaces which remain fixed under given conditions of flight;

“Aeroplane operator” means a person identified under article 5;

“Aeroplane owner” means a person, organisation or enterprise identified via Item 4 (name of owner) and Item 5 (address of owner) on the certificate of registration of an aeroplane;

“ACARS” means Aircraft Communications Addressing and Reporting System;

“Administrative partnership” means the delegation of administering tasks in this Order from one State to one or more other States;

“AFBO” means Average Fuel Burn Ratio;

“Air Operator Certificate” or “AOC” means a certificate issued by the CAA authorising an operator to carry out specified commercial air transport operations;

“CAA” means the Civil Aviation Authority of the United Kingdom;

“CERT” means the CO₂ Estimation and Reporting Tool regulated by Schedule 3;

“CO₂” means carbon dioxide;

“CO₂e” means carbon dioxide equivalent;

“Compliance period” means the relevant timeline set out in Schedule 1;

“Conversion process” means a type of technology used to convert a feedstock into aviation fuel;

“domestic flight” means the operation of an aircraft from take-off at an aerodrome in the United Kingdom or its territories, to landing at an aerodrome of the United Kingdom or its territories;

“Emissions Monitoring Plan” means the plan setting out how the aeroplane operator’s aviation emissions are to be monitored for the purposes of this Order;

“Emissions Report” means the report produced by the aeroplane operator for the purposes of article 31(1);

“Feedstock” means a type of unprocessed raw material used for the production of aviation fuel;

“Flight plan” means specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft;

“Fuel uplift” means the measurement of fuel provided by the fuel supplier, as documented in the fuel delivery notes or invoices for each flight, in litres;

“GHG” means Greenhouse gases;

“IAF” means International Accreditation Forum;

“IEC” means International Electrotechnical Commission;

“international flight” means the operation of an aircraft from take-off at an aerodrome of a State or its territories, to landing at an aerodrome of another State or its territories;

“ISO” means International Organization for Standardization;

“ISO 14064-3:2006” means ISO document entitled “Greenhouse gases -- Part 3: Specification with guidance for the validation and verification of greenhouse gas assertions”.

“ISO 14065:2013” means ISO document entitled “Greenhouse gases - Requirements for greenhouse gas validation and verification bodies for use in accreditation or other forms of recognition, Document published on: 2013-04”.

“ISO 14066:2011” means ISO document entitled “Greenhouse gases — Competence requirements for greenhouse gas validation teams and verification teams”.

“ISO/IEC 17011:2004” means ISO/IEC document entitled “Conformity assessment - General requirements for accreditation bodies accrediting conformity assessment bodies”.

“kg” means kilogrammes;

“MRV” means Monitoring, Reporting and Verification;

“MJ” means Megajoule;

“National accreditation body” means the body authorised by a State which attests that a verification body is competent to provide specific verification services;

“New entrant” means any aeroplane operator that commences an aviation activity falling within the scope of this Order on or after its entry into force and whose activity is not in whole or in part a continuation of an aviation activity previously performed by another aeroplane operator;

“Notifying State” means the State that has submitted to ICAO the request for the registration of or change in the three-letter designator of an aeroplane operator over which it has jurisdiction;

“Operator” means, for the purpose of this Order, the person, organisation or enterprise engaged in or offering to engage in an aircraft operation;

“Pathway” means a specific combination of feedstock and conversion process used for the production of aviation fuel;

“Regulator” is the regulator identified under article 10 for the purpose of this Order;

“scheme year” means the calendar year beginning on 1st January 2021 or any of the subsequent calendar years during which CORSIA applies; and a reference to a scheme year described by a calendar year, such as the “2021 scheme year”, is a reference to the scheme year beginning on 1st January of that year;

“SI units” means the international system of measurements that is based on particular metric units;

“source stream” means any of a specific fuel type, raw material or product giving rise to emissions of relevant greenhouse gases at one or more emission sources as a result of its consumption or production;

“State” means any State that is a signatory to, or has acceded to, the Convention on International Civil Aviation, signed at Chicago on 7th December 1944;

“State aircraft” means an aircraft used in the military, customs or police services;

“State pair” means a group of two States composed of a departing State or its territories and an arrival State or its territories;

“Verification of report” means an independent, systematic and sufficiently documented evaluation process of an Emissions Report;

“Verification body” means a person that performs the verification of an Emissions Report as an accredited independent third party;

“Verification team” means a group of verifiers, or a single verifier that also qualifies as a team leader, belonging to a verification body conducting the verification of an Emissions Report, whether or not supported by technical experts; and

“Verification report” means a document, drafted by the verification body, containing the verification statement set out in paragraphs 3(22) to (26) of Schedule 6 and required supporting information.