The 2001 Cape Town Convention on International Interests in Mobile Equipment and Aircraft Protocol represent one of the most ambitious and imaginative private commercial law projects ever to have been concluded. By providing an international legal regimen for security and related interests in aircraft objects, railway rolling stock and space assets, the Convention and Protocol help to reduce legal uncertainty caused by differences in national laws and thereby open up to developing countries' access to finance at reasonable cost. As Chairman of the UNIDROIT Study Group that initiated this project, Rapporteur to the three Joint Sessions of the UNIDROIT committee of governmental experts and the ICAO Legal Sub-Committee, and Chairman of the Drafting Committee at the Diplomatic Conference, Professor Sir Roy Goode was uniquely qualified to fulfil the mandate given to him by the Diplomatic Conference to prepare the Official Commentary on the Convention and Aircraft Protocol. This Revised Edition of the Official Commentary provides a detailed analysis of the two instruments. Major developments that have occurred since the publication of the original Official Commentary include the entry into force of the Convention and Aircraft Protocol, nearly 100,000 registrations in the International Registry and the experience of practitioners handling thousands of transactions relating to the two instruments. With over 50 illustrative examples and 13 Annexes, the Revised Edition of the Official Commentary is both an indispensable guide to all aspects of the Convention and Protocol and a compendious work of reference.