Delta Dental Plans Association (DDPA) was created in 1966 to bring together these local state service organizations and coordinate dental benefit programs for customers with employees in multiple states. A year later, the first multi-state program was sold by WDS to the International Association of Machinists. WDS ceded the administration for enrollees in other states to other Delta Dental member companies and contracted with the Blue Cross and Blue Shield Association for administration in those states without a Delta Dental affiliate organization.