Originally Posted by
wildway
Not exactly a country, but I don't believe any of the south Atlantic UK territories can be reached by miles... St. Helena, Ascnesion, and Tristan da Cunha. (If anybody figures out a way, please post!)
Techically, St Helena, Ascension and Tristan da Cunha are a single British Overseas Territory.
Ascension is served by seats on the Airbridge (currently operated by Air Seychelles on behalf of the UK Ministry of Defence). No miles can be earned or redeemed on "Air Panini" (as it is nicknamed for the in-flight catering) and the flights are dry too.
Neither St Helena and Tristan da Cunha has an airport - although St Helena might get one in a few years time.