The independent development of NAAs resulted in differing regulations from country to country. This required aircraft manufacturers in the past to develop different models for specific national requirements (such as the BAe Jetstream 31), and impeded airline travel into foreign jurisdictions. The Convention on International Civil Aviation (Chicago Convention) was signed in 1944 and addressed these issues. This then led to the establishment by the United Nations of the International Civil Aviation Organization (ICAO) in 1947 which now oversees member states, and works to implement regulatory changes to ensure that best practice regulations are adopted.
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