From 1949 to 1959, the number of courses increased from six to 64 and the number of students from 49 to 800.[22] ENAC benefited from the postwar development of aviation, and a number of students came from foreign countries or (in particular) overseas territories which later became independent.[23] During the early 1960s, the university began to accept its first students from foreign civil-aviation authorities.[24] Along with enrollment growth, courses were created to keep pace with new ratings. The navigation-instructor rating was introduced in 1956, and corresponding training began. Courses were sometimes introduced to meet a need, such as a speaking-technique course for instructors that year. The first civilian engineering students were also admitted in 1956. In 1958, the airline-pilot theoretical training course began.[23] Students took an annual trip from ENAC Orly, and were received (in full uniform) by local authorities on their arrival.[25]