This is the third edition of the acclaimed International Air Law and ICAO, first published in 2008. The book has been fully updated to take the latest developments into account. Specialized legal literature dealing with different aspects of international air law is rare, the developments often overtake the existing writings and there is a continuous need not only for updating but also for future-oriented thinking. There is a practical need for a compact but exhaustive and easily comprehensible textbook or reference book that deals with the most general aspects of international air law, as well as with the constitutional issues and law-making functions of the International Civil Aviation Organization (ICAO). This book fills this gap as it is a general treatise of the law of international civil aviation aimed at the needs of university students and educators, government authorities, airlines, practicing lawyers, journalists, international organizations and the general public.This book is motivated by the author's 25 years of experience (1966-1991) in the Secretariat of ICAO in Montreal - his last eight years as Director of the Legal Bureau. In equal measure the inspiration for the content of this book came from the author's academic work as Director of the Institute of Air and Space Law of McGill University (1989-1998) and his role as Professor of Law at that Institute until 2006 teaching this subject to graduate students from different parts of the world and different legal cultures.