Now you can participate in these battles in San Andreas!
Now if you click "no" when in Hydra, it will begin the Mission in which you need to shot down 8 enemy Hydr. Your protianiki will bomb you, and may even try to crash into your aircraft. You may opt-out of the mission by clicking "reply". The prize will get just by shooting down all enemies.
Also over the dam in the desert will fly the Hydra and adds 4 Hydra in different places of San Andreas. You can sit down and do some flying. Learn more about where they appear:
1. the mansion Of Doga-near the pool.
2. Construction in San Fierro.
3. not far from the school, next to a helicopter.
4. an abandoned runway.
5. in Las venturas near the House of Charles in an affluent area.