"Hypothermia and cold-water shock are a major concern for first responders and ... A look at the disappearance of Alaska flight. That's a less frequent problem today thanks to technology called ...

Planes carry transponders that transmit their real-time location. The Alaska plane stopped sharing that data on Thursday.

"Hypothermia and cold-water shock are a major concern for first responders and officials working ... A look at the disappearance of Alaska flight. That's a less frequent problem today thanks to ...