If you want to fly around the world you have a few choices. Most circumnavigators tend to fly along the equator, as there are plenty of routes and you can head East or West. If you want to go North to South you need your own plane.
To celebrate Pan Am’s 50th birthday in 1977, the airline took a Boeing 747SP and flew it around the world crossing both the North and South Pole. Their celebratory flight started in San Francisco, headed up north to cross the North Pole on its way to London. From there they continued down South to Cape Town. The next leg of the journey was entirely unique, flying straight to Auckland crossing over the South Pole, before continuing back to San Francisco and completing the circle. There is a great little film about this flight on YouTube and you can read more about Circumnavigation in Volume 5, out now.