The first air field in Florence was created in the Campo di Marte area in 1910, when military authorities allowed a field to be used for "experiments in air navigation". Campo di Marte thus became Florence's first airport, and remained so throughout the 1920s. However, the field was soon surrounded by houses and was inadequate for the new aircraft that were then replacing the first canvas-covered craft. In 1928, a location on the plain between Florence and Sesto Fiorentino was chosen. Peretola Airport opened there in the early 1930s.