From the contested prototype to rehabilitation, jobs on airlines, cruises, special flights and individual raids. The chronicles of important events until after the last Cruise. Memories and testimonies of those who took part in it. The industries and its creators, the bases and the seaplane bases, the airlines of the time. Aldo Alonge was born in Milan in 1921 and dedicated himself to aerofilatelia, he specialized in the postal services of the S.55, then extending research on this seaplane, on its history, businesses and its men.