Application  Interpretation  ( a ) “Doc 8643 — Aircraft Type Designators” is available from the ICAO website at www.icao.int. For a hard copy contact the  ICAO E-Commerce and Publications Sales Unit at International Civil Aviation Organisation (ICAO), 999 Robert-Bourassa  Boulevard, Montreal, Quebec H3C 5H7, Canada (telephone +1 514-954-8219 and e-mail sales@icao.int).  ( b ) Treaty Series No. 8 (1953); Cmd 8742.  ( c )  S.R. 2013 No. 160.  “Compliance period” means the relevant timeline set out in Schedule 1;  “CO$_{2}$” means carbon dioxide;  “CO$_{2}$e” means carbon dioxide equivalent;  “chief inspector” means the chief inspector constituted under regulation 8(3) of the Pollution  Prevention and Control (Industrial Emissions) Regulations (Northern Ireland) 2013( c );  “Chicago Convention” means the Convention on International Civil Aviation and its  Annexes( b ), signed in Chicago on 7th December 1944, as amended;  “CERT” means the CO$_{2}$ Estimation and Reporting Tool regulated by Schedule 3;  “CAA” means the Civil Aviation Authority of the United Kingdom;  “Air Operator Certificate” or “AOC” means a certificate issued by the CAA authorising an  operator to carry out specified commercial air transport operations;  “AFBO” means Average Fuel Burn Ratio;  “Administrative partnership” means the delegation of administering tasks in this Order from  one State to one or more other States;  “ACARS” means Aircraft Communications Addressing and Reporting System;  “Aeroplane type” means the aeroplane types described in “Doc 8643 – Aircraft Type  Designators”( a );  “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;  “Aeroplane operator” means a person identified under article 5;  “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;  “Aerodrome pair” means a group of two aerodromes composed of a departing aerodrome and  an arrival aerodrome;  “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;  4.  In this Order—  (3) The aeroplane operator must provide supporting evidence of such activities to the  verification body or, upon request, to the Regulator.  3. —(1) Subject to paragraph (2), this Order applies to civil international aviation undertaken by  aeroplane operators for whom the United Kingdom is the administering State, in accordance with  article 8, under this Order.  (2) This Order does not apply to the following flights—  (a) humanitarian, medical and firefighting flights, or to international flights preceding or  following a humanitarian, medical or firefighting flight provided such flights are  conducted with the same aeroplane, and are required to accomplish the related  humanitarian, medical or firefighting activities or to reposition the aeroplane after that for  its next activity, or  (b) flights by State aircraft.  5