REWARDS - Respect, $50,000
Toreno calls in for one more favor from you. Get into the boat and drive towards the yellow blip. Drive your boat to the back of the cargo hold, then bail out swim inside the ship. Sneak up the ramp and use the boxes to get to the other side without being seen. If you get spotted, the person who spotted you will go and sound the alarm. If the alarm sounds, then your cover is blown.
Head through the hatch and go up the first set of steps. Don't go up the second, but follow the path around to the SAM control room. Once it's disabled, head down the hull and locate the Hydra jets. Pick the Hydra at the far end of the hull, but before you do that destroy the other two to lessen your work for later. Take off and you should have a Hydra come after you now (if you left the other two in the hull, you would have 3 on you). Take it out by following the instructions on the screen.
Once that's done, head toward the spy ships. Keep making passes until you blow up all four. Once all four are gone, Toreno wipes his hands clean of the situation. Head to your airstrip and land the plane anywhere on the strip. Once you land, guide the plane into the hangar to finish the mission.