From the Rega FAQ:
http://www.rega.ch/en/about-us/faq.a...d=150#Frage250
What benefits do I enjoy as a Rega patron?
As a token of appreciation for this support, Rega can, at its own discretion and within the bounds of its resources, waive the costs for the services for patrons, wholly or in part. This includes both rescue services that Rega provides itself and any services of other providers which it organises. Such services can only be provided at reduced or no cost, however, if health insurers and other insurance companies or other liable third parties do not or only partially cover the costs of the rescue mission.