Arthur Gouge has written:

'Flying boats and their possible developments' -- subject(s): Seaplanes

sea airport

or sea shells

NEW RESPONDENT

Yes there are. Seaplanes, float-planes and flying boats are splashing down and taking off on/from water airports, which is the name given to "airport on water".

Flying boats are airplanes that have the fuselage shaped like a boat. Pontoon planes are regular planes that have pontoons added to allow them to float.

Seaplanes.
Amphibious aircraft are capable of landing on both water and land. They are sometimes referred to as seaplanes, flying boats or float-planes.

Yes. it has two hulls- one on an extension, in a sense a forerunner of pontoon boats or floats used on seaplanes, or catamarans, which have two hulls.