Starships fall into the same 4 Categories as monsters or class roles: Striker, Defender, Leader and Controller. Each also has a base level rating. A player character or party may only pilot a craft up to 3 levels higher than their average level, so a level 3 group could pilot up to a level 6 craft. Levels are determined by the armament and equipment on the ship the same way character classes have powers.
Like PCs, Starships have 4 defenses: AC = Deflector Shields, Reflex = Maneuverability, Constitution = Hull Strength, Will = Circuitry and Systems.
Ships have at-will and recharge powers like monsters.