Be sure your pilot has training in that specific model helicopter before you board.

FORBES: 10 Essential Checks Before You Step Into A Helicopter

The basic model of the helicopter can also be adapted for medical evacuation or a purely offensive combat role.

BBC: News | In Depth | Military Fact Files

And United Technologies, which makes Sikorsky helicopters, has flown a large model electric-helicopter powered by a hydrogen fuel cell.

ECONOMIST: Electric planes

The grounding of a Super Puma helicopter model following an incident off Shetland last October has hit growth in passenger numbers at Aberdeen International Airport.

BBC: Super Puma grounding hits Aberdeen air traffic