Co-op is in Ace Combat Online. The campaign is not a shared story co-op mode in the launch reports. Choose Co-Op Assault for the regular PvE score competition; Co-Op Warfare includes direct combat with another player squad.
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Can two players fly the story campaign together?
The campaign co-op thread explicitly answers no and distinguishes that wish from the existing multiplayer mode. Plan your story progress separately, then meet in Online for cooperative sorties. The presence of “Online Co-op” on a store listing does not describe a shared campaign save.
No future campaign co-op announcement is established by these sources. If your goal is to help a friend through Mission 28, you can compare their loadout and result, but this guide does not claim you can join that campaign mission.
Choose the kind of match you want
| Mode | What you are choosing |
|---|---|
| Co-Op Assault | Two squads of four compete by scoring against enemies |
| Co-Op Warfare | Two squads of four fight directly, with NPC forces also present |
| Scramble | Four players against a rival NPC force; a special mission |
| Emergency Sortie | An eight-player superweapon encounter; a special mission |
The publisher overview describes these formats. If you want cooperative enemy combat, start with Assault. For competitive player combat, use Warfare. Do not assume that every mode carrying “Co-Op” excludes hostile players.
Cross-play and progression boundaries
The publisher describes cross-platform Online play. That confirms platform compatibility at the mode level, not a verified account-linking or invitation procedure. Use the squad and lobby options displayed in your client; we do not invent friend-code screens.
Each player should check their own online aircraft and upgrade state. If a special mission never appears, use the availability checks. If you have a communication error instead, keep that separate from the mode choice and record the exact code.
Sources & limits
Community reports are attributed, not tests performed by this site. Builds are unspecified unless stated.
- Steam: campaign co-op clarification ↗
Original read October 4, 2026. Launch-period report; game build unspecified.
- Bandai Namco: online formats in Game Overview ↗
September 25, 2026; core and special mode formats.
- Bandai Namco: Ace Combat Online ↗
Official cross-platform Online context, checked October 4.