Flagship

A flagship is a warship used by the commanding officer of a fleet or battle group. It can be any warship and is not restricted to any particular classification; however, it is typically one of the largest ship types within the fleet, such as a cruiser or a carrier, even an orbital platform.

Covenant

 * Seeker of Truth: Unknown
 * Ascendant Justice: Supercarrier
 * Sublime Transcendence: Supercarrier
 * Incorruptible: Reverence-class cruiser
 * Shadow of Intent: Assault carrier
 * Truth and Reconciliation: CCS-class battlecruiser
 * Long Night of Solace: Supercarrier

UNSC

 * Forward Unto Dawn: Frigate
 * Trafalgar: Supercarrier
 * Hopeful: Mobile battlefield hospital
 * Leviathan: Marathon-class cruiser
 * Pillar of Autumn: Halcyon-class cruiser
 * Everest: Super-heavy cruiser
 * In Amber Clad: Frigate
 * Cairo Station: Orbital defense platform
 * UNSC Infinity: Infinity-class vessel