We have had the same type of briefing information come from the military side. They have said that they need three crews--actually, three choppers--situated in this circumstance in Gander, two under maintenance and one at the ready, just to have one response ready at any point in time, and it sounds as if the same is true for the dedicated chopper for the oil rigs.
On February 1st, 2011. See this statement in context.