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• a  extending across or crossing either pole
  transpolar air routes

• Declared purposes of the flight were 1) to set a distance record; 2) to confirm the feasibility of regular transpolar flyingi.
• General Umberto Nobile, famed Fascist transpolar flyer: "Major Pomarici, one of my most distinguished colleagues in the transpolar flight preparations, went to sleep, last week .
• It seems doubtful that even such sturdy characters as Shackleton and his crew could have made a transpolar crossing.