The Contracting States


According to Article 52 of the Convention on International Civil Aviation, also named Chicago Convention, this Convention shall be open for adherence by members of the United Nations and States associated with them. States members of the International Civil Aviation Organization (ICAO) are also named Contracting States (Article 1 of the Chicago Convention) or Members States.

Contracting States have usually established a Civil Aviation Authority (CAA) within their country as the regulatory body in the field of civil aviation primarily dealing with safety issues and responsible for the regulation of air transport services to/from/within the country and for the enforcement of civil air regulations, air safety and airworthiness standards. It co-ordinates all regulatory functions with ICAO by taking the policy decisions necessitated by the advances made in the field of International Standards and Recommended Practices (SARPS) adopted in the ICAO Annexes. The CAAs are headed by the Director General of Civil Aviation (DGCA); depending on the structure of the states, the CAAs may take other names such as the Directorate General of Civil Aviation or are established under the Ministry of Transportation.

ICAO communicates with its Contracting States through the DGCAs by the means of States Letters and Electronic Bulletins (For information only). DGCAs and their experts participate in ICAO meetings and follow-up action thereon. At ICAO, DGCAs meet for high-level discussions or strategies in the field of aviation either during Assembly Sessions or subject-dedicated conferences.


Service cover sent from the Direccion General de Aeronautica Civil

(Directorate General of Civil Aviation) in Honduras

to the Secretary General at ICAO. Postmarked on 1 June 1959.


Service cover sent from the Directorate General of Aviation in Costa Rica

to the Director of Technical Cooperation at ICAO. Postmarked on 18 May 1963.


Service cover sent from the Ministry of Aviation in United Kingdom to ICAO’s Chief of Finance Branch.

Dated 22 February 1965.


Uruguay – 15 to 17 June 1972 – First Day Cover

National Congress of the Dirección General de Aviación Civil

(Directorate General of Civil Aviation)


Service cover sent from the Civil Aviation Department in Vietnam

to the Secretariat General at ICAO. Postmarked on 5 February 1974.


Service cover sent from the Director of Civil Aviation in Singapore

to the Director of Technical Assistance Bureau at ICAO. Postmarked on 10 April 1979.


Service cover sent from the Ministry of Transportation in Madagascar

to the President of the Council of ICAO. Postmarked on 16 March 1993.



Ethiopia - 7 December 1994 - 50th Anniversary of ICAO – First Day Cover.

The stamps show the emblems of the 50th anniversary of ICAO

and of the Ethiopian Civil Aviation Authority.


Nauru – 14 December 1994 - 50th Anniversary of ICAO.

The stamp is part of a series of 4 stamps and one souvenir sheet.

It shows the ICAO logo and Nauru’s Civil Aviation Authority emblem.


Service cover sent from the Civil Aviation Authority of Mongolia to ICAO.

ICAO Incoming stamp dated 11 January 2003.


Service cover sent from the Directorate General of Civil Aviation (DGCA) in France

to ICAO EUR/NAT Office in Paris. Postmarked on 10 October 2005.


Commemorative cover issued for the Directors General of Civil Aviation Conference (DGCA/06),

held in Montréal, Canada from 20 to 22 March 2006.

Autographed by Dr. Assad Kotaite, Chairman of the Conference and President of the ICAO Council,

and Dr. Taïeb Chérif, Secretary General.

During this conference, Directors General of the 189 Contracting States of ICAO assessed the current status of aviation safety, identified ways to achieve significant improvements and developed a safety framework for the 21st century – a Global Strategy for Aviation Safety – in an assertive, coordinated and transparent manner.



Philippines – 7 December 2009.  

65th Anniversary of ICAO and 2009 International Civil Aviation Day. The margins of this miniature sheet show the logos of various international organizations and offices in the Philippines which are associated to or working with the Department of Transportation and Communications of the Philippines (DOTC).

At the top-left side of the souvenir sheet is the logo of the CAA of the Philippines (CAAP).