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In page Whitehorse:

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In 1920, the first planes landed in Whitehorse and the first air mail was sent in November 1927. Until 1942, rail, river, and air were the only way to get to Whitehorse, but in 1942 the US military decided an interior road would be safer to transfer troops and provisions between Alaska and the US mainland and began construction of the Alaska Highway.[citation needed] The entire 2,500 km (1,600 mi) project was accomplished between March and November 1942. The Canadian portion of the highway was only returned to Canadian sovereignty after the war. The Canol pipeline was also constructed to supply oil to the north with a refinery in Whitehorse.[citation needed]