Under the terms of the deal, a consortium led by US investment fund Global Infrastructure Partners (GIP) will sell a 50.01 per cent stake to Vinci Airports.
The airport, the eighth busiest in Europe by passenger numbers, was heavily disrupted in the runup to Christmas after reports of drone sightings closed its runway.
Around 1,000 Gatwick flights were cancelled or diverted across three days last week after drones were spotted inside the airport perimeter.
The crisis ruined the pre-Christmas travel plans of tens of thousands of people.
However, there were subsequent suggestions there may never have been any drones at Gatwick, although police later played them down and said the reports were down to “poor communications”.
Michael McGhee, GIP partner, said: “We expect the transaction to be completed by the middle of next year, with the senior leadership team remaining in place.
“Their focus, along with everyone at Gatwick, obviously remains on doing their very best for customers over the busy holiday period after the challenges of recent days.”
The GIP consortium bought Gatwick in 2009 for £1.5bn.
The senior management team at Gatwick will stay in their posts following the deal, with chairman Sir David Higgins, chief executive Stewart Wingate and finance chief Nick Dunn continuing in their roles.
GIP will continue to manage the remaining 49.99 per cent interest in Gatwick after the transaction closes in the second quarter.
Nicolas Notebaert, president of Vinci Airports, said: “As Gatwick’s new industrial partner, Vinci Airports will support and encourage growth of traffic, operational efficiency, and leverage its international expertise in the development of commercial activities to further improve passenger satisfaction and experience.”
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