The author has recently returned from Brazil after completing a four‐year contract with the Brazilian Air Ministry. This paper presents some views and developments resulting from this experience and relates them to the potential and important field of co‐operative aeronautical development programmes between Britain and countries with a rapid rate of industrial detelopment such as Brazil. The paper commences with a general review of current aeronautical development in Brazil and then presents a relatively detailed account of initial project work relating to an executive/transport aircraft. Throughout these phases accent is placed on the difference of outlook of a people who are looking towards a great future development of their country. It is finally concluded that there is a potentially large development market in which Britain can and should take a leading part and from which could eminate substantial mutual advantages. This co‐operation should however only be undertaken on a national basis and with a full understanding of the particular conditions relating to such countries.