( a ) ICAO document entitled “CORSIA Annual Sector’s Growth Factor (SGF)” 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).  35 30th September 2021 The Regulator must calculate and inform  aeroplane operators attributed to it of their  average total CO$_{2}$ emissions during 2019 and  2020, in accordance with article 33(1).  30th November 2021 The Secretary of State must submit updates to  the list of aeroplane operators that are attributed  to the United Kingdom to ICAO in accordance  with article 8(5), as well as updates to the list of  verification bodies accredited in the United  Kingdom in accordance with article 11(3). 1st January 2022 to 31st December 2022 The aeroplane operator must monitor, in  accordance with Chapter 2 of Part 3 of this  Order, CO$_{2}$ emissions for 2022 from  international flights.  1st January 2022 to 30th April 2022 The aeroplane operator must compile 2021 CO$_{2}$  emissions data to be verified by a verification  body, in accordance with Chapter 4 of Part 3 of  this Order.  30th April 2022 The aeroplane operator and the verification  body must both independently submit, upon  authorisation by the aeroplane operator, the  verified Emissions Report and associated  Verification Report for 2021 to the Regulator in  accordance with article 35(3).  1st May 2022 to 31st July 2022 The Regulator must conduct an order of  magnitude check of the verified Emissions  Report for 2021 in accordance with article  35(4) including any filling in of data gaps in  case of non-reporting by aeroplane operators in  accordance with article 37(6) and (7). 30th June 2022 The Secretary of State must notify ICAO of any  change in the decision by the government of the  United Kingdom to voluntarily participate, or to  discontinue the voluntary participation, in the  applicability of CORSIA’s offsetting  requirements under Part II, Chapter 3 of  Volume IV of Annex 16 to the Chicago  Convention from 1st January 2023 in  accordance with article 7(1). 31st July 2022 The Secretary of State must submit required  information regarding CO$_{2}$ emissions for 2021  to ICAO in accordance with article 33(3).  1st August 2022 The Regulator must obtain and use the ICAO  document entitled “CORSIA States for Chapter  3 State Pairs” applicable for the 2023  compliance year.  31st October 2022 The Regulator must obtain and use the Sector’s  Growth Factor (SGF) for 2021 from the ICAO  document entitled “CORSIA Annual Sector’s  Growth Factor (SGF)( a )”.