Thousands of civil aircraft cross the expanse of the North Atlantic each year, often flying above Iceland, Greenland, and the Faroe Islands. Coordinating and securing these skies has depended for decades on a unique set of international treaties known as the DEN/ICE Agreements. These agreements support critical air traffic control, communication, and weather services along routes north of the 45th parallel.
Cooperation between nations above the clouds
The legacy of joint action in this region dates back to the aftermath of the Second World War. An early step was a 1946 pact on weather ship funding, closely followed by a 1947 six-nation agreement to keep operating long-range navigation facilities in southern Iceland. With Denmark’s involvement, joint funding extended to other North Atlantic stations by 1949.
The system became fully institutionalised in 1956. That year saw agreements signed in Geneva, aimed at sharing the cost and responsibility for running aviation-related services in Iceland, Greenland, and the Faroe Islands. These came into effect in 1958 and have been updated over the years as technology and aviation changed.
A network supporting safe flights
The philosophy of these agreements is simple: countries share the financial and operational burden for services that benefit all, regardless of which national airspace an aircraft passes over. Iceland and Denmark together pay a fixed share of operating costs, with additional funding in proportion to the number of commercial flights run by each participating country’s airlines. Since 1974, aircraft operators themselves have also contributed.
The combined budget supports a range of interconnected systems. In Iceland, the Reykjavík centre manages much of the sky above with extensive communication networks extending to Canada, Scotland, and England. Meteorological stations in towns like Bolungarvík, Höfn, and Keflavík provide weather data essential for flight safety.
Greenland relies on a similar set-up. Its services include air traffic control based in Søndre Strømfjord and multiple weather and radio stations scattered along the coast and interior, including non-directional beacons and satellite links. The Faroe Islands connect into the network with radar and data facilities, ensuring coverage even in remote airspace.
In 2003, the annual cost was US$26.7 million, with the majority funding operations in Iceland. The agreements have remained open for any country wishing to participate, managed under the International Civil Aviation Organization, a part of the United Nations.
For nearly 70 years, the DEN/ICE Agreements have stood as a model of international effort in one of the world’s most challenging flying environments, helping hundreds of planes travel safely between continents every day.
