Instead, it is subcontracted to recognised maintenance contractors. Columbia Development Corporation was formed a subsidiary of HRD using subcontracted Rouse Company employees. Some are subcontracted as freelancers or consultants. Construction and operation is subcontracted through public tenders, while consultants are used for planning. Other companies have been subcontracted to provide expertise in specific areas. It has subcontracted its maintenance operations to BNSF. Most services are subcontracted to local coach companies. Boeing Corporation subcontracted the Delco Electronics Div. All of Emery's cargo operations have been subcontracted to other airlines. Ball Aerospace has been subcontracted to develop and build the Optical Telescope Element (OTE). Garbage collection is subcontracted to a private company. The platform was subcontracted to a company working for the Russian energy giant Gazprom. Operation of the system is subcontracted to a private company. Intamin subcontracted Stakotra to assist with construction. As a budgetary consideration, production was subcontracted to South Korean animation studio AKOM.