Where can you buy a grit hockey tower in the GTA?
go to the grit website, they have a list of all places you can buy
In every gta game you have to unlock them but in gta 4 you put cheats in. The other gta games you can fly by completing the missions. If you are on about the big passenger planes you cannot fly them in any gta game apart from san Andreas and gta 4 but in gta 4 you have to buy them with Microsoft live points.