Sikorsky Aircraft Corporation

Keystone Helicopter Corporation is one of the largest and oldest helicopter services companies in the United States. Keystone Helicopter operates a large fleet of turbine helicopters at numerous air medical locations in the eastern U.S. and services even larger numbers of helicopters from its very substantial, state-of-the-art technical service depot near Philadelphia. For five decades, Keystone Helicopter has been known as the high-quality helicopter service partner of choice for its many world-class customers. The company was founded on the core values of quality and safety, and those remain its driving principles.