Heathrow is to start signing contracts with engineers, architects and planning consultants after being given the go-ahead by the Government to build a new runway.
The airport's development director said initial contracts will be signed "within days", stressing the opportunities for British businesses of all sizes.
Phil Wilbraham said 95% of Heathrow's spending on expansion procurement will be with British companies, including 60% outside London.
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Up to 700 jobs in the British steel industry will be supported, and a number of new supply chain hubs will open to help build the new runway, including a site in Scotland.
By 2030, Heathrow will have doubled its number of apprenticeships - to 10,000.
Mr Wilbraham said the Government's decision means the "economic taps will be turned on", adding: "We will sign the first contracts within the coming days and weeks, beginning the process of injecting tens of millions in to the British supply chain and supporting jobs across the UK. This will be the first stage of delivery for Britain's new runway."
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The Airports Commission estimated that a new runway at Heathrow would create up to 180,000 jobs and generate up to £211 billion of economic benefits.
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