I now that Bukkit is really the same as the Orginal Minecraft server. But I am asking about there are different ab.class ac.class ... at the Minecraft server I now all of these are the same as for example BlockBed.class BiomeForest.class ... I am asking about of a list of these classes. If a such list exist please post here. (I wan't to make Planes and Guns working with Bukkit)
You can do that with the API, don't download CraftBukkit, but Bukkit (on ci.bukkit.org). Then read some tutorials on how to plugin develop.