Phoenix Logs/Banished Units/Phantom
From Halopedia, the Halo wiki
The Phantom is a fast, heavily armed aerial transport available to the Arbiter. It is armed with heavy plasma cannons for engaging enemy air and ground targets, and can embark up to two infantry squads using its integral grav lift. These squads can fire from the Phantom, or be deployed at any time with the Eject ability. The Phantom's speed can be increased with the Swift Wings upgrade.
The Enduring Conviction carried a number of Phantom dropships to augment its existing stocks of Spirit troop carriers and Lich deployment platforms when it deployed to the Ark. The Banished Phantoms that would have been used by the Arbiter are heavily modified to serve as gunships and firing platforms, and are capable of long-range subluminal travel.