(1) In this Order -

"2021-2025 allocation period" means the 2021, 2022, 2023, 2024 and 2025 scheme years;

"2026-2030 allocation period" means the 2026, 2027, 2028, 2029 and 2030 scheme years;

"account" means account in the registry;

"Activity Level Changes Regulation" means Commission Implementing Regulation (EU) 2019/1842 of 31 October 2019, as it forms part of domestic law;

"aerodrome" means a defined area (including any buildings, installations and equipment) on land or water or on a fixed, fixed offshore or floating structure to be used either wholly or in part for the arrival, departure and surface movement of aircraft;

"aircraft operator" has the meaning given in article 6;

"aircraft operator holding account" means an aircraft operator holding account opened under paragraph 13(3) of Schedule 5A;