Rescue services talk about the 'golden hour' which refers to the first hour after a traumatic injury, when emergency treatment is most likely to be successful.
Cameron said adding an extra 20 to 30 minutes of flight time to a mountain rescue situation where hypothermia was often a factor was likely to push the arrival of emergency services outside the 'golden hour' window and could be the difference between life and death.
He said local communities were always generous with donations for what they see as their local rescue helicopter service.
"With a good chunk of funding coming from public donations, it remains to be seen if the loss of a rescue helicopter service would affect public donation from that region.
"The Ruapehu region and our National Parks are on target to have more than a million visitors per year in addition to servicing the resident population there is already a high workload.
"The increasing demands on rescue helicopter services may require new thinking about how they can be funded, such as a compulsory levy or insurance cover for tourists."