A flagship is a vessel that commands operations in a Fleet; it can be any warship and is not restricted to, nor does it describe, any particular class of vessel. This is the ship, or sometimes an orbital platform, that houses the Commander of the Fleet/Armada/Battlegroup and his or her senior staff.
Speculation
It is possible that Battlecruisers and Carriers are usually the Flagships of a Fleet or smaller unit structure.
Known Flagships
Covenant
- Seeker of Truth: CAS-class assault carrier
- Ascendant Justice: CAS-class assault carrier
- Sublime Transcendence: CSO-class supercarrier
- Incorruptible: Reverence-class cruiser
- Shadow of Intent: CAS-class assault carrier
- Truth and Reconciliation: CCS-class battlecruiser
- Long Night of Solace: CSO-class supercarrier
- Solemn Penance: CAS-class assault carrier
UNSC
- UNSC Forward Unto Dawn: Charon-class light frigate
- UNSC Trafalgar: Punic-class supercarrier
- UNSC Hopeful: Mobile Battlefield Hospital
- UNSC Leviathan: Marathon-class cruiser
- UNSC Pillar of Autumn: Halcyon-class light cruiser
- UNSC Everest: Valiant-class super-heavy cruiser
- Cairo Station: Orbital Defense Platform
- UNSC Infinity: Infinity-class supercarrier