Abstract: A manufacturing and assembly method of parts of an aircraft comprising the following several steps. Providing a first aircraft part comprising a receptor surface on which a coupling surface of a second aircraft part is to be assembled. Providing a model of the first and the second aircraft parts in their assembled position, the model of the second aircraft part comprising machining allowances in its coupling surface. Digitalizing the receptor surface of the first aircraft part. Positioning the digitalization in the computer model in the assembled position such that the digitalization of the receptor surface intersects the coupling surface of the second aircraft part. Obtaining a model of the second part in which the coupling surface fits the digitalized receptor surface. Mechanizing the second aircraft part.