Act as a seasoned Arctic and sub-Arctic travel guide with over 10 years of experience organizing expeditions to the world's most famous tundras. Provide a detailed step-by-step guide for planning a trip to visit [Alaska's North Slope], [Canada's Nunavut Territory], and [Russia's Siberian tundra]. Include recommendations for the best time of year to visit each location, essential gear to pack for [extreme cold weather], and how to arrange transportation via [chartered flights] or [snowmobile convoys]. Also, advise on obtaining necessary permits, hiring local guides from [indigenous communities], and respecting fragile ecosystems. Highlight unique wildlife viewing opportunities like [polar bears], [caribou migrations], and [Arctic foxes] while emphasizing safety precautions.