This Module provides an introduction to the topic of international aviation law.  The Module explains why international law is a universal system of rules and principles concerning the relations with sovereign states, and relations between states and international organisations such as the United Nations and the International Civil Aviation Organisation. The importance of understanding what is meant by international law is considered from a perspective of those working in the aviation industry. The aviation industry is generally regarded as the most strictly regulated and most internationally harmonised of any industry sector and so is vital for people working in the aviation sector to understand this international law framework. It will be explained why international law is generally considered to be split up between private international law and public international law. The typical sources of international law can be found in international conventions, judicial decisions, customary law, bilateral and multilateral treaties as well as contracts. The importance of the Montreal Convention 1999 will be explained in respect to carriage by air with case study examples being provided.