JUNEAU, Alaska - Authorities launched a search Tuesday for a medical helicopter that vanished while carrying a patient and three other people.

http://www.msnbc.msn.com/id/22099015/

I spent a few months in that area in the 90's with the USCG. I would think the only thing more difficult than maritime SAR there would be a SAR case in some of those mountains. Let's wish them all luck.