the concept is quite believable compared to what I watched last night on the tele ...
Sky Captain & the World of Tomorrow.
The Captain flew a shark-mouth P-40E (with dicky seat) - quite a good CGI effort apart from the too-tall chrome tube undercarriage. It could also go underwater, propelled by two pop-out jets on the rear fuselage
Other aircraft were Sky-Crawler type twin-engine bullet fighters with V-tails. On entering the water the props came to a stop, slid back to the rear spinner & started spinning again !!