SAI / Skandinavisk Aero Industri
Kramme & Zeuthen

Skandinavisk Aero Industri A/S (abbreviated SAI) was a Danish manufacturer of aeroplanes that existed between 1937 and 1954. The company was founded by technician Viggo Kramme (1905–1984) and engineer Karl Gustav Zeuthen (1909–1989) and based in Copenhagen.

The company's aeroplanes were labelled "KZ" for Kramme and Zeuthen, the first being the KZ I from 1937. The KZ IV was built as an ambulance plane for Zone-Redningskorpset and introduced in 1944. Post-war sales never reached the company's expectations, and production turned unprofitable in the early 1950s, driving the company to shutdown. In mid-1950s turned increasingly to repair and maintenance of military aircraft, and aircraft production had ended by late 1950s. In total, about 200 planes were built by the company.

A number of the KZ planes have been preserved. As of 2005, Dansk Veteranflysamling (The Danish Collection of Vintage Aircraft) exhibits a specimen of each of the 11 aircraft models manufactured by the company.