When Niko and Roman move to Bohan, and Mallorie introduces Niko to Elizabeta, there is a mission Niko carries out for Elizabeta, called Blow Your Cover. Accompanied by Playboy X, Niko goes to Broker to oversee a heroin deal, which of course goes wrong. Once he and Playboy have fought their way out of trouble, Niko has to drive Playboy back to his apartment in North Holland, Algonquin. It is at this point that Algonquin is unlocked, and therefore Modo and Perseus are available to shop in, as they are exclusively situated in Algonquin.
there are planes only on GTA: san Andreas but you need to unlock them by completing missions
how to unlock missions in gta sanandreas
you have to do missions to unlock the islands :)
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.
finish more missions
you have to do a lot of missions
Once Algonquin is unlocked, after completion of the mission for Elizabeta called Blow Your Cover, Niko will be able to shop in Perseus and Modo. There are two Perseus stores and one Modo store in Algonquin.
There is no cheat to unlock Starfish Island. You have to do the missions up to "Guardian Angels" to unlock the island.
do all the missions then do the one where you escape from portland :P
To unlock the bonus missions you must collect the twin lions of fo and sinc your game with wi-fi. If you have the I phone the missions become available after collecting the lions of fo.
well you have to play to a certain number of missions and you will unlock the hunter quarry missions. complete those and the dumper will spawn there.
You have to do the beginning missions & about the 4th one, one of your home boi'z will say go get some "gang colors" and it will be open.