Keystone Helicopter is one of the largest and oldest helicopter services companies in the United States. Founded in 1953, Keystone operates a large technical services depot and completion center near Philadelphia. The firm also operates a large fleet of turbine helicopters in numerous locations across several eastern states, primarily in the air medical mission. Keystone Helicopter is owned by Keystone Ranger Holdings, Inc., a Philadelphia-area private equity investment organization that specializes in aviation-related ventures. Additional information is available on the Web at: www.keystonehelicopter.com and at www.rangeraerospace.com.