Ace Combat 6: Fires of Liberation features various downloadable content (DLC), which can be purchased and downloaded from the Xbox LIVE Marketplace.
In 2016, all DLC for Ace Combat 6: Fires of Liberation was removed from the Xbox LIVE Marketplace; players who already bought DLC could still re-download purchased content, however, new players are not able to buy anything.
The following were only available via code to players who pre-ordered the game.
- F-15E -MOBIUS-: A Mobius 1-themed F-15E Strike Eagle. No performance changes.
- F-15E -YELLOW SQUADRON-: A Yellow 13-themed F-15E Strike Eagle. No performance changes.
The following were made available on October 23, 2007.
- F-16C -TYPE ACE 2-: An Ace Combat 2-themed F-16C Fighting Falcon.
- Reduced: Air-to-ground, mobility, speed, ammo, no special weapons
- Increased: Defense, stability, air-to-air
- F-14D -HALLOWEEN-: Free. A Halloween-themed F-14D Super Tomcat.
- Reduced: Overall performance, ammo
- Added: Stealth
- F-15E -ACTIVE STRIPES-: An F-15E Strike Eagle with the signature paint scheme of the F-15 S/MTD test aircraft.
- Reduced: Overall performance, ammo
- Increased: Mobility
- F-16C -SCARFACE EMBLEM-: No longer available. An Ace Combat 2-themed F-16C Fighting Falcon.
- Reduced: Speed
- Increased: Defense
- Su-33 -THE IDOLMASTER MIKI-: the first aircraft of the THE iDOLM@STER line, a Flanker-D portraying the likeness of Miki Hoshii.
- F-16C HISTORIC WINDHOVER: an F-16C featuring the paint scheme used by Daniel Pollini, callsign "Windhover".
- Mirage 2000-5 EXPERIMENTAL: a Mirage 2000-5 boasting the colors of the cancelled Mirage 4000 prototype.
- A-10A -THUNDER SHARK- an A-10A Thunderbolt II boasting fearsome "sharksmouth" nose art.
- F/A-18F SCARFACE EMBLEM: an F/A-18F Super Hornet with the colors of the 92nd Special Tactical Fighter Squadron "Scarface".
- Mirage 2000-5 -SCARFACE EMBLEM-: an Scarface-themed 2000-5.
- F-22A -MOBIUS-: an F-22A Raptor provided with the legendary paint scheme of Mobius One, the main character of Ace Combat 04: Shattered Skies.
- F-15E -CIPHER-: the first Ace Combat Zero aircraft, this Strike Eagle is given the colors of main character Cipher.
- F-15E -PIXY-: the second "Galm" aircraft, an F-15E with the paint scheme used by Cipher's wingman, Larry Foulke.
- A-10A -XMAS-: a Christmas-themed A-10A.
- F-117A -THE IDOLMASTER YUKIHO-: the second iM@S aircraft, an F-117A featuring the likeness of idolm Yukiho Hagiwara.
- CFA-44 PROTOTYPE: the experimental CFA-44 Nosferatu before its acquisition by Ilya Pasternak.
- Su-47 -THE IDOLMASTER MIKI-EX-: the iDOLM@STER Su-33's successor, this Berkut has been endowed with unmatched mobility.
- Tornado GR.4 -RAGING SHARK-: a Tornado GR.4 with a "sharksmouth" design.
- F-14D -RAZGRIZ-: an F-14D Super Tomcat with the colors of the Razgriz Air Command Squadron, the heroes of Ace Combat 5: The Unsung War.
- Su-33 -YELLOW SQUADRON-: an Su-33 with the famous paint scheme used by the Yellow Squadron.
- Typhoon -UPEO EMBLEM- - a Typhoon based on the EF-2000E Typhoon II from Ace Combat 3: Electrosphere. Receives an stability upgrade while taking a minor blow to air-to-air/ground.
- F-117A -GENERAL EMBLEM-: No longer available. A customized F-117A with the colors of General Resource.
- Razgriz Set 01: the first set of "Razgriz" aircraft. Includes the F-2A, F-16C, Rafale M and Su-33.
- Mirage 2000-5 -ADVANCED-: a modified 2000-5 homaging the French film "Les Chevaliers du Ciel".
- Su-33 -CRIMSON WING-: a crimson Su-33 customized for airshows.
- F-15E -THE IDOLMASTER CHIHAYA-: an iM@S F-15E with the likeness of Chihaya Kisaragi.
- Battle Royale DL #1: a Battle Royale map set in the Glava Islands area.
- Co-op Battle DL #1: a cooperative version of "Ragno Fortress".
- Siege Battle DL #1: a Siege map set in Sipli Field.
- Ace of Aces Map #1: the first Ace of Aces mission.
- F-22A -GRYPHUS EMBLEM-: No longer available. A Raptor with that of the emblem of Gryphus Squadron
- Razgriz Set 02: the second Razgriz aircraft set. Includes the A-10A, Su-47 and Typhoon.
- F-22A -INDIGO WING-: a Raptor modified for airshows.
- F-14D -ZIPANG-
- F-22A -THE IDOLMASTER HARUKA-
- Mirage 2000-5 -THE IDOLMASTER YAYOI-
- Co-op Battle DL #2: a co-op version of "Chandelier".
- Ace of Aces Mission #02: an AoA version of "Vitoze Aerial Defense".
- Orange, Violet Set: a plane pack containing the Typhoon -ORANGE WING- and Su-47 -VIOLET WING-.
- Typhoon -ROT-
- F-16C PJ EMBLEM: No longer available. An F-16C with the paint scheme of Ace Combat Zero wingman Patrick James Beckett, better known as "PJ".
- Razgriz Set 03: the third Razgriz set. Includes the CFA-44 -RAZGRIZ-, Tornado GR.4, F/A-18F and F-15E.
- Rafale M -THE IDOLMASTER IORI-.
- Su-33 -TYPE ACE2-: based on Ace Combat 2, this Flanker-D is stripped of all SP weapons for a genuinely old school experience.
- Su-47 -GRABACR EMBLEM-: the second aircraft of Pack 09 displays the colours of the Grabacr Squadron, the main antagonists of The Unsung War.
- Razgriz Set 04: the last pack of Razgriz aircraft. Contains the F-22A Raptor, F-117A Nighthawk and the Mirage 2000-5.
- Jungle, Flamingo Set: a set containing the F-14D -JUNGLE WING- and A-10A -FLAMINGO WING-.
- iDOLM@STER Futami Twins Set: an iM@S pack containing the F-16C -Mami- and F-2A -Ami-.
- A-10A -DISTANT THUNDER-: a Thunderbolt II paint scheme homaging Ace Combat 5 ace "DistantThunder".
- Typhoon -TYPE ACE3-: a Typhoon given a full UPEO conversion, designed to resemble the EF-2000E.
- F-14D -THE IDOLMASTER AZUSA-: a Super Tomcat given an iM@S redesign, featuring the likeness of Azusa.
- Su-47 -GAULT-: an Su-47 with the colours of the Belkan 5th TFS Gault, the ringleaders of "A World With No Boundaries".
- F-14D -WARDOG EMBLEM-: a Wardog-themed F-14D paint scheme.
- F/A-18F -THE IDOLMASTER RITSUKO-: this Super Hornet has been provided with a lime green Idolmaster paint scheme, portraying Ritsuko Akagi.
- Dark, Shining Set: a two-plane pack featuring the F-2A -DARK WING- and Rafale M -SHINING WING-.
- Ace of Aces Mission #03: the third Ace of Aces mission. Brave your way through the Estovakian defense perimeter and liberate Sipli Field.
- A-10A -THE iDOLMASTER SP-: an special iM@S aircraft featuring all characters portrayed in Fires of Liberation.
- CFA-44 -ACES-: a CFA-44 adorned with a Project Aces redesign.
- Rafale M -ESPADA-: the last downloadable aircraft released for Ace Combat 6; a Rafale M homaging Marcela "Macarena" Vazquez from Ace Combat Zero.
- Typhoon -THE iDOLMASTER MAKOTO-: the final aircraft of the iDOLM@STER line and the last aircraft released for Ace Combat 6, a black Typhoon emblazoned with the likeness of idol Makoto Kikuchi.