Strandtown Travel, trading as Acetours, collapsed on Thursday (5 November).
Based in County Down, Northern Ireland, its tours were led by owners Alan and Ann Couser.
Between them, the pair shared nearly 80 years’ travel experience, according to the Acetours website.
The business specialised in tours to Europe and the Middle East, ranging from walking holidays to city breaks and river cruises.
The CAA, on Thursday, confirmed Strandtown Travel (NI) Limited (Atol 11029) had ceased trading.
“The company based in County Down traded under the names Acetours Acetours.en, Acetours.eu and Strandtown Travel and website www.acetours.eu,” said the CAA.
Acetours last issued an update on its activities during the Covid crisis on 3 July, in which it said it had been in touch with every passenger booked for summer 2020 “on a twice-weekly basis”.
“We expect to have clarification in the coming days about when international travel may resume and we’ll continue to keep you posted,” said the firm.