"This is KR Zero-One requesting permission to land. One passanger- Chairman Prescott."
— The pilot of KR Zero-One requesting permission to land on the Sovereign
KR Zero-One was a King Raven that transported Chairman Richard Prescott and two Onyx Guards from Azura to the CNV Sovereign following the First Battle of Azura. Marcus Fenix noted that the Raven was newer and nicer than the remaining Ravens onboard Sovereign, and Dom Santiago wanted to give the Raven the "stranded welcome", by stripping it for spare parts.Soon after its landing, a Lambent attack on the ship killed the deck chief, preventing the Raven from taking off. Delta-One was able to clear the landing bay of Lambent and raise the deck lift, allowing the Raven to take off.
It is possible that the call sign "KR Zero-One" is given to any King Raven carrying the Chairman of the Coalition of Ordered Governments, similar to the call sign "Air Force One" given to any Air Force aircraft carrying the President of the United States.
It is also notable that unlike most Ravens it has a door to the passanger compartment.