Londonaire? Really! That boat's been in Ft. Lauderdale longer than the Spruce Goose in mothballs. I never knew it by that name! However, we had our own names for it, including...
... airboat
... seaplane
... floating fuselage
... Buffet's barge
And my favorite, well... it rhymes with Toys for Tots.
"Yachts for *****"