RCNs were issued for flight-inclusive packages when customers postponed their travel plans during the pandemic.
RCNs were given Atol protection in July 2020, backdated to 10 March 2020 and extended until 19 December 2021. Although notes are still valid, they will no longer be financially safeguarded from 30 September.
The CAA said: “If a travel company stops trading after 30 September 2022, consumers with outstanding Atol refund credit notes will not be covered by the scheme, and they risk losing out on the money they have paid.