Hydra
The Hydra is the first jet fighter to appear in any GTA game. Its concept is derived from the McDonnell Douglas (now Boeing)/British Aerospace AV-8B or the Harrier Gr. 7 (as it's known in the UK). Its nose is slightly longer than the standard AV-8B, meaning it has the AN/APG-65 RADAR carried by the AV-8B+... even though the APG-65 RADAR was not integrated until the late 90s. It lacks the Harrier's external 25mm cannon. The Hydra also includes an auto repair system which can repair the main body of the craft after minor impact. However it can not repair the wings or a head on crash. It is equipped with lock on missiles and flares as countermeasures. It's the fastest aircraft in all of San Andreas and one of the easiest to fly. You can switch between hover and flight mode by pushing the right analog stick forward/back. The Hydra can be attained by a cheat code or at "Easter bay naval station" at "Verdant Meadows" air strip after "Vertical bird", at Sweets house after 100% completion and at "Area 69" after "Black Project".
Enemy Hydras will deploy missles at the aircraft if the player attempts to get in. Two Hydras will go after the player at 4 star Wanted Level or higher and try to take down the player. The only way to destroy two Hydras is to go around them to confuse them and then go right behind them. Enemy Hydras can be destroyed by launching missles, but they don't seem to give up without a fight. The Hydra can be blown to bits multiple times if inflicted too much damage by missles, landing on the ground hard, crashing into a building, slamming head-on to the choppers, or even other Hydras.