The prototype of the AC-4. The airframe served with Ad Astra and Swissair. To HB-IKO and D-ELIS. Restored in the 1980s and flown as HB-IKO again. Deregistered in 2010. Photo from: ETH-Bibliothek Zürich
This photo was added on 12 July 2019, and has since been viewed 439 times.