in my company we are not allowed to use sondrestromford, or iquilat in the planning of en route diversion airfields. iam unsure of the exact reasons, but i bet the high ground and difficult approaches have something to do with it. also sondrestomford has a very low rff catagory overnight (below my company/caa minima) in years gone by, the company could apply for a rff catagory upgrade should we have to rely on sondrestomford for etop's, but since the introduction of our "long range" a/c there is no need. iquilat iam led to beleive has a permenant low or no rff catagory at all status, thus proving iligal and unsafe to use. however should murphy ever raise his ugly head and the unthinkable ever happen, eg, a serios on board fire, or multiple engine malfunction, i wouldn't hessitate to use either. i know this will sound cruel but, for a medical case i would continue to the assigned div airport (possibly goose bay, or keflavik) rather than risk an approach. at the end of the day i also have a responsibility to the other pax, none of whom would thank me for slamming into a mountain, or skidding off the runway in pieces.
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IT'S BETTER TO BE ON THE GROUND, WISHING YOU WERE IN THE AIR - THAN IT IS TO BE IN THE AIR, WISHING YOU WERE ON THE GROUND !