ICAO and the International Telecommunication Union


ITU Logo

The ITU logo was intended to symbolize the speed of communications, equal to that of lightening, and to illustrate the fact that ITU promotes the development of the world-wide network through its regulation, coordination, planning and standardization activities.

With headquarters in Geneva, the International Telecommunication Union (ITU) or Union internationale des télécommunications (UIT) is the eldest organization in the United Nations UN family still in existence. It was founded as the International Telegraph Union in Paris on 17 May 1865 by its twenty founding members and is today the leading UN agency for information and communication technology issues, and the global focal point for governments and the private sector in developing networks and services. ITU has been at the center of advances in communications, from telegraphy through to the modern world of satellites, mobile phones and the Internet. The ITU is governed by the plenipotentiary conference at which all members are represented; it normally meets once every four or five years.


For more than 145 years, ITU has coordinated the shared global use of the radio spectrum, promoted international cooperation in assigning satellite orbits, worked to improve telecommunication infrastructure in the developing world, established the worldwide standards that foster seamless interconnection of a vast range of communications systems and addressed the global challenges of our times.

Since its establishment in 1865, ITU had sought to reach uniformity in the international telegraph systems. To these activities, it added telephony in 1903 and radiotelephony in 1906 (Radio was invented in 1895; its first application was for radio-telegraphy in 1896). In 1906, the first International Radiotelegraph Convention was signed in Berlin by 27 countries. The inclusion of radiotelephony went hand-in-hand with the unofficial establishment of the International Radiotelegraph Union (IRU) in 1906. ITU never established an actual IRU, but the term IRU generally referred to the group of countries adherent to the Radiotelegraph Conventions.


From 3 September to 9 December 1932, the International Radiotelegraph Conference was held in Madrid simultaneously with the International Telegraph Conference. The most significant decision made at this conference was to fuse the International Telegraph Union and the International Radiotelegraph Union to create a single organization: the International Telecommunication Union. In addition, a new convention embracing the three fields of telegraphy, telephony and radio was created by combining the International Telegraph Convention (1865) and the International Radiotelegraph Convention. The new International Telecommunication Convention served as ITU’s charter and constitution, establishing its legal existence and setting forth its purposes, compositions, structure and functions. On 15 November 1947, an agreement between ITU and the newly created United Nations recognized ITU as the specialized agency for telecommunications. The agreement formally entered into force on 1 January 1949.


The need for close working relations between ICAO and ITU was obvious from the coming into being of ICAO, owing to the extensive dependence and ever-increasing demands of civil aviation upon aeronautical telecommunication services. A fruitful co-operation had characterized those relations from the beginning and broadened over the years. ICAO celebrates this cooperation every year on 17 May: World Telecommunication and Information Society Day.

Annex 10

In 1950, as a modus vivendi governing consultations among the four organizations with the broadest mutual interest in telecommunications matters (i.e. ITU, ICAO, IMO and the proposed Inter-governmental Maritime Consultative Organization, IMCO) was approved by ITU’s Administrative Council (during its Fifth Session); following this arrangement, each organization shall (1) invite the others to its conferences or meetings where questions of common interest would be studied; (2) include in the agenda of its conferences and meetings questions submitted by any of the other organizations; (3) keep the others constantly informed of contemplated tasks and programmes believed to be of common interest and supplied with all relevant documents of mutual interest, subject to such measures as might be necessary to protect confidential material; and (4) take all possible steps to facilitate mutual collaboration, including the formation, whenever desirable, of mixed committees comprising technicians of the organizations particularly competent in the matters  under consideration. The first three measures had already been applied by ICAO and ITU for several years before this agreement was resolved.


With ITU's leadership in the creation of international telecommunications networks and standards, close coordination has been assured between ICAO and ITU for the development of certain parts of Annex 10 Aeronautical Telecommunications, so as to align ICAO standards, recommended practices and procedures, and guidance material with the relevant provisions of ITU. This Annex 10 covers three of the most complex and essential elements of international civil aviation. i.e. aeronautical communications, navigation and surveillance. Annex 10 is divided into five volumes:

- Volume I: Radio Navigation Aids;

- Volume II: Communication Procedures including those with PANS status;

- Volume III: Communication Systems divided into two parts: Part I: Digital Data Communication Systems and Part II: Voice Communications Systems;

- Volume IV: Surveillance Radar and Collision Avoidance; and

- Volume V: Aeronautical Radio Frequency Spectrum Utilization.


In 1868, the second International Telegraph Conference was convened to revise the International Telegraph Convention, the tariffs and the Regulations for international service; a major decision of this plenipotentiary conference was the establishment of a permanent secretariat in Berne, Switzerland. In 1948, the headquarter​​s of ITU were moved from Berne to Geneva. The significant date of 17 May, the day of signing of the International Telegraph Convention in 1865, eventually became the World Telecommunication and Information Society Day. On that day, ICAO celebrates its cooperation with the ITU which is crucial to the safety and efficiency of aeronautical telecommunications.


Looking forward, with record-breaking continued air traffic growth and the introduction of a variety of new aviation technologies that will place new and unique demands on the aeronautical radio spectrum, the unique cooperation between these two UN sister agencies promises to be stronger, deeper, and more critical than ever.


Service cover sent by ITU to ICAO Chief, Library.

Postmarked on 20 July 1956. A.D. Thiessen was the first Chief, Library at ICAO.

When ICAO came into being, active measures were taken to ensure that the Organization had at its disposal an aeronautical and general library appropriate to the needs of the staff and national representatives. The object had been to acquire a collection of basic reference books and current publications on subjects within the Organization’s field of interest.


Service cover sent by ITU to ICAO Secretary General C. Ljungberg.

Postmarked on 9 October 1958.


Argentina – Second Thematic Philatelic Exhibition (TEMEX ’60) held in Buenos Aires from 4 from 9 December 1960. During this exhibition, a total of 12 covers were released paying tribute to the United Nations, its Programmes and Specialized Agencies; all covers are similar, except for the emblem, the colors of the UN Buildings in New York and the date of release. These covers were issued on different dates ranging from 4 to 9 December 1960; the above cover related to ITU was dated 7 December 1960.


Service cover sent by ITU to ICAO Secretary General.

Postmarked on 20 February 1962.


Service cover sent by ITU to ICAO Secretary General.

Postmarked on 12 June 1969.


Service cover sent by ITU to ICAO Chief of Personnel Branch.

Postmarked on 25 September 1970 - UIT/ITU Slogan.


Madrid, Spain – 9 December 1982 - First Day Cover commemorating the 50th anniversary of the ending of ITU’s Plenipotentiary Conference.