User blog comment:Hendrik498/Unknown possible beta boat and plane in GTA SA?/@comment-26674001-20180604101919

Nope. They are the Hydra and Aircraft carrier model kits visible in Zero RC, along with the Tourismo (sic), ZR-350, Jester Crossflow, SWAT Van 92 and NRG-500. And FWIW, the model is actually of the LHD-069, so going to carry on this discussion on that talk page (someone posted it in 2013 but was ignored).