There are still bite marks in the ceiling and walls of my playroom from when I was trying to do this in my Classic FS9.1 about 15 years ago.
Trouble is, to get floatplanes to use water taxiways and runways, you need to create 'invisible' ones as Holger describes. As soon as an AI amphib senses a runway, it will drop its wheels. I wanted amphibs to drop wheels for land runways and keep them raised for water landings. It couldn't be done.
Another thing was, ATC doesn't know where planes are, unless they 'have a wheel on the ground'. On water, the plane can drift off the invisible runway and ATC just forgets it is still at the Hold point. I eventually got round this by putting in a fake contact point directly under the C of G, or the Reference Datum. If you put the floatplane on still water and use Ctrl+Z, you will see the altitude is shown as something like 6 or 7 feet. That is because the instrument is in the fuselage of the plane. So the radius of your fake wheel will be 6ft or whatever. Adding a fake wheel in this way does not alter the displayed model.
Eventually, I had a regular AI schedule using AI Twotter floatplanes (NOT the amphibs) working between Shep's Plymouth (by the late Ray Sheppard) via Calshot to a fictional base I created in Suffolk. The flightplans were created in AFCAD2
Pretty sure the files will be in a backup somewhere. But forget about AI Amphibs - that way lies madness
MikeW
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