The Junkers F.13 with floats
The Junkers was the first full-metal commercial aircraft. the pilots had still an open cockpit, but the passengers had a closed, warm cabin.
The F.13 came with floats and skies, tho it could be used on any surface, whta made it pretty universal in usage. The SL-Version comes with floats as well, chooseable by menu.
Quelle: Junkers F.13 mit Schwimmers