The purpose of the National Patient Travel Center is ".....to ensure that no financially-needy patient is denied access to distant specialized medical evaluation, diagnosis or treatment for lack of a means of long-distance medical air transportation."

The NPTC exists to facilitate patient access to appropriate charitable medical air transportation resources in the United States. The NPTC also exists to develop, administer and consolidate airline patient ticket programs and to operate various Special-Lift and Child-Lift programs on behalf of special disease organizations and/or clinical research centers in the United States.

http://www.patienttravel.org/