There are recent photos of con-trails of super-fast aerial object travelling from Antrarctica to the north pole area.
Con-trails only remain visible for about thirty minutes before they disperse, so the object that left this con-trail must have been going at 10,000 mph or more. Admiral Byrd said on his return from an expedition to the south pole after WW2 that we might have to fight in future aerial craft that could travel from one pole to another virtually instantly. His expedition was terminated early when he lost several warships apparently due to bad weather but did he have a battle with flying saucers that it is rumoured that he encountered?