OBS_VALUE: Air carriers having operated at least 80 % of the slots allocated to them in the preceding scheduling period are entitled to the same slots in the equivalent scheduling period of the following year (so called grandfather rights).In the context of the COVID-19 pandemic, Regulation 2020/459 suspended the 80/20 grandfathering rule intially until 24 October 2020. However, this will be extended into 2021. Accordingly, airport coordinators shall consider slots allocated for this period as having been operated by the air carrier to which they were initially allocated. 