Cal. Gov. Code § 14036.7
The department shall give high priority to the development of direct linkages between intercity rail passenger services and airports served by commercial airlines and to developing feeder bus linkages connecting intercity rail services and airports. The department shall coordinate its provision of feeder bus service with local and regional bus and rail services to avoid duplication of service. The department shall include in the rail passenger development plan prepared pursuant to Section 14036, a report on the status of all existing intercity rail station facilities that serve airports directly and indirectly and on the department's activities in improving other linkages between rail service and airports. The department shall, to the extent feasible, utilize alternative-fuel buses for its feeder bus service.
Ca. Gov. Code § 14036.7