In 1911, Rennella persuaded a local sportsman's club, the Club Guayas de Tiro Aviacion (Guayas Shooting and Aviation Club), to sponsor his pilot's training; his aim was to be the first flier in Ecuador.
On 8 October 1913, at Guayaquil, Cosimo Rennella became the first Ecuadorian citizen to fly in his own nation.