i presume you refer to the nimitz,
anywho, the problem with the nimitz is that different parts of the deck do different things, some parts to can walk on ok, some you sink thro and some you cant move on anyway,
to get infantry and vehicles on deck place them on deck in the editor then in thier init field put this setpos [getpos this select 0,getpos this select 1,19]
as for makeing aircraft land, virtually impossible for AI planes but with choppers just do the same with an invisible helipad this setpos [getpos this select 0,getpos this select 1,19] that should make the helipad on deck and make the chopper land