How do you get a jetpack in Grand Theft Auto San Andreas for Xbox 360?

The Jet Pack - GTA: San Andreas:

In the game, CJ carries out a mission for The Truth in Area 69 secret military base. Truth asks CJ to steal a certain item from within the base's interior during this mission called Black Project. Once CJ has fought his way into the laboratory, he finds the prototype jet pack the army has been testing, and he takes it and flies it out of the base. He gives it to The Truth, but eventually gets it back during another mission for The Truth, called Green Goo. After completion of this mission, CJ gets to keep the jet pack and it appears near The Flying School Office at Verdant Meadows, and will continue to re-spawn.

I understand that this is a cheat code for Xbox 360, if you want to try it out:

To be pressed during gameplay:

Left, Right, LT, LB, RT, RB, Up, Down, Left, Right