The Titan Job is a mission in Grand Theft Auto Online as part of the Agents of Sabotage update. It is part of the Oscar Guzman Flies Again mission strand.
Description[]
After stealing the DH-7 Iron Mule and the Titan 250 D ammunition from Eberhard, Oscar Guzman is ready for the job. A Homing Launcher will be provided to the player.
Thanks to the intel they acquired by hacking into the Eberhard servers, Oscar was able to track down the Titan 250 D used by Eberhard to disrupt the Cape Catfish weapons deal. Depending on the amount of extra resources collected in the ammunition setup, an extra weapons loadout featuring a Combat MG Mk II with armor piercing rounds and various other high-grade weapons, and heavy armor which doubles the players' HP, will be present at the hangar and may be equipped before boarding the Mogul.

Depending on the player's choice in Setup: Mogul, Oscar will either fly the player to the Titan's location in the Mogul they stole, or will provided air support to the player's Mogul by flying alongside him in his own separate Mogul.
As both Eberhard-owned Moguls are not tracked as enemy aircrafts, they can reach the Titan 250 D up close during the job. Oscar will use the previously stolen signal jammers from the sunken cargo to mess with the Titan's signals.

The player must use the Mogul's weapons to damage the Titan 250 D and shoot down Eberhard's enemy helicopters escorting the plane. The Titan 250 D can take a huge amount of damage before going down, so the Mogul upgrades package from the previous setup, which gives it dual front MGs, dual turret guns, cluster bombs and improved handling, should make this process a bit faster. Upon reaching Raton Canyon, an Eberhard Kosatka will emerge and fire remote controlled missiles at the Moguls, which can either be shot down with the top turret or evaded by performing maneuvers.
More of Eberhard's air support will show up in Pyros and Weaponized Conadas as they approach Los Santos, and will fire unguided missiles and machine gun shots at the Mogul. These, unlike the Kosatka's missiles, cannot be shot down and must be evaded.

After dealing enough damage to the Titan 250 D, the plane will send out a "mayday" signal and will be forced to reroute for an emergency landing at the Grand Senora Desert. At this point, the player is allowed to abandon the Mogul and drive to the Titan's landing location.
Arriving at the location, they will find the Titan grounded and surrounded by Eberhard's security guards. In order to get the Titan back in the air, the player must manually repair the vehicle's engine by pressing the correct buttons from the indicator, while defending themselves from the enemies.
Meanwhile, Oscar heads to McKenzie Field to pick up the DH-7 Iron Mule and use it to deliver the Titan's ammunition to the Titan 250 D. Oscar will drop off the ammunition crate next to the Titan, and the player must load it onto the plane to be used in the final part of the job. More Eberhard reinforcements both on foot and in Weaponized Conadas will be sent as the ammunition is being loaded. The Titan and the ammunition box will help protect the player's front and back, but leave them vulnerable to the sides, with a Barrage and an Insurgent exploiting the opening in front of the Titan.
After the Titan 250 D is successfully repaired and loaded with ammunition, the plane is ready to take off once again.
Oscar will send the location of Eberhard's Operation Centers, their Kosatka submarine and an Eberhard Freight Train. The player must maintain altitude to the right of each target and use the Titan 250 D's ammunition to destroy the targets. The weapons are on the left side of the plane and can be accessed via the plane's gun camera. More Eberhard reinforcements will approach the Titan in Pyros and Weaponized Conadas, and the Kosatka will fire multiple remote control missiles at the Titan at once, but they should pose no threat to the Titan as long as they are taken out quickly.
After dealing huge property damage to Eberhard and stealing their Titan 250 D in retaliation for Oscar's disrupted weapons deal, the player is free to land the stolen plane at McKenzie Field to be taken apart and sold by Oscar.