The Air Navigation Bureau develops technical studies for the Air Navigation Commission as well as recommendations for Standards and Recommended Practices (SARPs) relating to the safety, regularity and efficiency of international air navigation for the Council.
The Air Transport Bureau, under the direction of the Air Transport, Unlawful Interference and Joint Support Committees: provides expert assistance required by the Assembly, Council, Air Transport Committee (ATC), Committee on Unlawful Interference (UIC), Committee on Joint Support of Air Navigation Services (JSC) and the specialized conference, divisional, panel and working group meetings that may be convened in the air transport field.

The Legal Bureau provides advice and assistance to the Secretary General and through him to the various bodies of the Organization and to ICAO Member States on constitutional, administrative and procedural matters, on problems of international law, air law, commercial law, labour law and related matters. It includes research and studies in the field of private and public international air law regarding items on the General Work Programme of the Legal Committee and preparation of documentation for the Legal Committee, Diplomatic Conferences, Council, its subordinate bodies and the Assembly. The Legal Bureau is responsible for the depositary functions of ICAO under several treaties, as well as the registration of agreeements or arrangements pursuant to Articles 81 and 83 of the Chicago Convention. The functions of the Legal Bureau also include cooperation and coordination in legal activities with the United Nations and other international organizations.
ICAO's Technical Co-operation Programme will assist you in project implementation with Neutrality, Transparency and Objectivity.
The Bureau of Administration and Services is responsible for providing the administrative support required by the Organization relating to personnel, language and publications, conference and office services, information and communication technology, registry, distribution and sales, Web, library and archives, Assembly and Council Secretariat and quality management.