Fleet and operations data  3.  The following fleet and operations data is required—  4. —(1) The methods and means of calculating emissions from international flights during the  periods specified in this paragraph are as follows.  (2) If the aeroplane operator uses the CERT as described in Schedule 3, the following  information must be provided—  ( a ) The aeroplane operator using the estimation functionality of the CERT to assess its eligibility to use the CERT could use the  output of the tool (i.e. list of States) as input to the Emissions Monitoring Plan submission.  ( b ) The aeroplane operator using the CERT could use the functionality of the CERT to identify flights subject to offsetting  requirements in accordance with paragraph 3.1, Chapter 3, Part II in Volume IV of Annex 16 to the Chicago Convention in  a given year of compliance as long as the aeroplane operator uses the correct version (i.e. year of compliance) of the CERT.  ( c )  Guidance on estimating CO$_{2}$ emissions for 2019 is provided in the Environmental Technical Manual (Doc 9501), Volume  IV – Procedures for demonstrating compliance with the Carbon Offsetting and Reduction Scheme for International Aviation  (CORSIA) which 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).  52 (ii) Block Time input method.  (i) Great Circle Distance input method, or  (b) the type of input method used in the CERT, namely—  Methods and means for establishing the average emissions during the 2019-2020 period  (a) an estimate of CO$_{2}$ emissions for all international flights for 2019( c ) with supporting  information on how the estimation was calculated, and  Methods and means of calculating emissions from international flights  (h) procedures for identifying domestic flights and/or humanitarian, medical or firefighting  international flights that would not be subject to the requirements in Part 3 of this Order.  (g) procedures for determining which international aeroplane flights are subject to offsetting  requirements under Part II, Chapter 3 of Annex 16, Volume IV to the Chicago  Convention( b );  (f) list of States to where the aeroplane operator operates international flights at the time of  initial submission of the Emissions Monitoring Plan( a );  (e) procedures for determining which aeroplane flights meet the definition of international  flights and are therefore subject to the requirements in Part 3 of this Order;  (d) procedures on how the specific flights of an aeroplane will be tracked to ensure  completeness of monitoring;  (c) procedures on how changes in the aeroplane fleet and fuel used will be tracked, and  subsequently integrated in the Emissions Monitoring Plan;  (ii) a list of the nationality or common mark, and registration mark of aeroplanes that are  explicitly stated in the air operator certificate, or equivalent, and used in Item 7 of the  aeroplane operator’s flight plans if the aeroplane operator does not have an ICAO  Designator;  (i) ICAO Designator used in Item 7 of the aeroplane operator’s flight plans, or  (b) information used for attributing international flights to the aeroplane operator, being—  (ii) type of fuel used by the aeroplanes;  (i) aeroplane types with a maximum certificated take-off mass of 5,700 kg or greater  and the number of aeroplanes per type, including owned and leased aeroplanes, and  (a) list of the aeroplane types and type of fuel, such as Jet-A, Jet-A1, Jet-B, and AvGas, used  in aeroplanes operated for international flights at the time of submission of the Emissions  Monitoring Plan, recognising that there may be changes over time. The list must  include— 