Tuning

The Customization System is an innovative gameplay addition included in Ace Combat X: Skies of Deception (and confirmed to re-appear in Ace Combat X2: Joint Assault), which allows the player to customize the game's fictional aircraft at will with a wide range of parts, raning from engines to targeting systems to armor, which allows the player to adjust the airframes to his/her play style. Note how the All designation means that all aircraft, excluding the Fenrir, can be outfitted with that particular part.

Scale Armor

 * Description: Composed of multiple anti ballistic panels resembling the scales of a fish.
 * Compatible aircraft: Apalis, Fregata, Forneus, Cariburn, FALKEN
 * Unlocked by: Clear mission 03A
 * Stat changes: +Defense ; -Speed/Mobility/Stability
 * Price: $4200

CFRP Conversion

 * Description: The fuselage is replaced with a radar absorbent material increasing stealth properties.
 * Compatible aircraft: Apalis, Forneus, Cariburn
 * Unlocked by: Destroy star unit in mission 04B
 * Stat changes: +Stealth/Speed;-Stability/Defense
 * Price: $5400

Ceramic Armor

 * Description: Extremely tough ceramic armor.
 * Compatible aircraft: All
 * Unlocked by: Clear mission 07A or 07B
 * Stat changes: +Defense, -Speed/Mobility/Stability
 * Price: $6800

RAM Coat

 * Description: A radar absorbent coat increases stealth properties.
 * Compatible aircraft: Forneus, XFA-27, X-02
 * Unlocked by: Destroy star unit in mission 07C
 * Stat changes: +Stealth, -Defense
 * Price: $11300

Beetle Armor

 * Description: Tough anti ballistic armor characterized by its exquisite curvature.
 * Compatible aircraft: Fregata, Forneus, XFA-27, FALKEN
 * Unlocked by: Destroy star unit in mission 08B
 * Stat changes: +Mobility/Defense up, -Speed/Stability
 * Price: $8100

NERA Armor

 * Description: The armor's inner liner reacts upon impact effectively reducing damage.
 * Compatible aircraft: Apalis, Fregata, Forneus, Cariburn
 * Unlocked by: Destroy star unit in mission 11B
 * Stat changes: +Defense, -Speed/Mobility
 * Price: $9500

Titanium Armor

 * Description: Tough armor made from a dense alloy.
 * Compatible aircraft: Apalis, Fregata, XFA-27, FALKEN
 * Unlocked by: Clear mission 12A
 * Stat changes: +Defense, -Speed/Mobility/Stability
 * Price: $13800

Light Armor

 * Description: Light weight achieved at the expense of protection.
 * Compatible aircraft: Apalis, Fregata, Forneus, X-02
 * Unlocked by: Destroy starred unit in mission 12C
 * Stat changes: +Speed/Mobility/Stability, Light Weight; -Defense
 * Price: $12600

Adv Titanium

 * Description: Complete titanium armor boasting excellent defense properties.
 * Compatible aircraft: Apalis, Fregata, XFA-27, FALKEN
 * Unlocked by: Destroy star unit in mission 15A
 * Stat changes: +Defense, -Speed/Mobility/Stability
 * Price: $20700

Diffusion Coat

 * Description: Highly advanced radar diffusion technology increases stealth properties.
 * Compatible aircraft: Forneus
 * Unlocked by: Use the YR-99 Forneus to clear Mission 09A with S ranking
 * Stat changes: Increased Radar Diffusion, -Defense
 * Price: $49600

TiAl Armor

 * Description: Next generation lightweight titanium aluminide armor.
 * Compatible aircraft: All
 * Unlocked by: General Total Rewards amount of 1,000,000
 * Stat changes: +Defense, -Speed/Mobility/Stability
 * Price: $35700

Composite Armor

 * Description: A highly impact resistant armor composed of various materials.
 * Compatible aircraft: All
 * Unlocked by: Play the multiplayer mission "Escort"
 * Stat changes: +Defense, -Speed/Mobility/Stability, Increased Weight.
 * Price: $16900

Emergency Auto-Pilot System

 * Description: Automatically adjusts the aircraft's position at low altitude to reduce chances of crashing.
 * Compatible aircraft: All
 * Unlocked by: Clear mission 05A
 * Stat changes: Stability up
 * Price: $7600

Raven

 * Description: Software designed to increase air-to-air capabilities.
 * Compatible aircraft: All
 * Unlocked by: Destroy star unit in mission 06A
 * Stat changes: +Air-to-Air; Air-to-Ground
 * Price $6500

Terra Hammer

 * Description: Software designed to increase air-to-ground capabilities.
 * Compatible aircraft: All
 * Unlocked by: Destroy star unit in mission 06B
 * Stat changes: +Air-to-Ground; -Air-to-Air
 * Price: $6500

Hawk Eye

 * Description: A system designed to amplify the camera's magnification.
 * Compatible aircraft: Fregata, Forneus, Cariburn, FALKEN
 * Unlocked by: Destroy star unit in mission 08A
 * Stat changes: N/A (Camera Zoom)
 * Price: $5900

Automatic Machine gun Fire Device

 * Description: Machine gun is automatically fired when gun reticule is displayed.
 * Compatible aircraft: Apalis, Fregata, Cariburn, XFA-27, X-02
 * Unlocked by: Clear mission 11A
 * Stat changes: +Air-to-Air/Air-to-Ground
 * Price: $12500

Tracer

 * Description: The trajectory of airborne objects is displayed on the HUD.
 * Compatible aircraft: Forneus, Cariburn, XFA-27, FALKEN, X-02
 * Unlocked by: Destroy starred unit in mission 10A
 * Stat changes: +Air-to-Air/Peripheral Lock-On Range
 * Price: $13200

AAM Jammer

 * Description: Decreases radar lock-on capability of enemy missiles.
 * Compatible aircraft: Apalis, Fregata, XFA-27, FALKEN, X-02
 * Unlocked by: Destroy star unit in mission 11A
 * Stat changes: Radar Jamming; -Defense
 * Price: $21100

Fenrir ECMS

 * Description: Powerful jamming waves are released effectively destabilizing enemy lock-on.
 * Compatible aircraft: Apalis, Fregata, Forneus, Cariburn
 * Unlocked by: Destroy star unit in mission 15B
 * Stat changes: Lock-on Disrupter; -Defense
 * Price: $38500

Earth Shaker

 * Description: Instantly analyzes landscape for increased air-to-ground capabilities.
 * Compatible aircraft: Apalis
 * Unlocked by: Employ XFA-24A Apalis to complete mission 03A with S rank
 * Stat changes: +Air-to-Ground up; Wide Lock-on
 * Price: $34200

Sniper OS

 * Description: The gun reticule is directly linked to the direction of the machine gun automatically aligning fire.
 * Compatible aircraft: All
 * Unlocked by: Destroy 300 air targets
 * Stat changes: Automatic Gun Reticle; +Air-to-Air/Air-to-Ground
 * Price $33000

Argus

 * Description: The seeker is linked directly to the coffin system, widening the range of operation.
 * Compatible aircraft: Fregata, Forneus, Cariburn, FALKEN
 * Unlocked by: Unknown
 * Stat changes: Wide Lock-on, Multi Lock-on; +Air-to-Air/Air-to-Ground; -Stability
 * Price $42000

Salamander

 * Description: A highly versatile advanced firing control system.
 * Compatible: All
 * Unlocked by: Play multiplayer mission "Base Assault"
 * Stat changes: +Air-to-Air/Air-to-Ground, Multi-Lock
 * Price: $14400

Trivia

 * The Fenrir is the only fictional fighter which cannot be upgraded in any way.