<a href="https://en.wikipedia.org/wiki/Caproni_Ca.60" class="extiw" title="w:Caproni Ca.60">Caproni Ca.60</a> experimental flying boat on <a href="https://en.wikipedia.org/wiki/Lake_Maggiore" class="extiw" title="w:Lake Maggiore">Lake Maggiore</a>, 1921. The Caproni Ca.60, or Transaereo, was a nine-wing flying boat intended to be a prototype for a 100 passenger trans-atlantic airliner. It featured eight engines and three sets of triple wings.
Unknown author<span style="display: none;">Unknown author</span>
1921
From english wikipedia article: <a href="https://en.wikipedia.org/wiki/Caproni_Ca.60" class="extiw" title="en:Caproni Ca.60">Caproni Ca.60</a>. Image from: <a rel="nofollow" class="external autonumber" href="http://www.raravia.com/caproni60.htm">[1]</a>