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In page Phnom Penh International Airport:

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In January 2018, the Cambodian government approved a proposal to build a new airport to serve Phnom Penh that will cost an estimated US$1.5 billion.[1] The new international airport will replace the existing Phnom Penh International Airport, with initial plans having the facilities being constructed on partially reclaimed land adjacent to Boueng Cheung Loung, a large lake in Kandal province about 30 kilometres south of Phnom Penh.