Spanish infrastructure giant Ferrovial is seeking to offload three regional British airports as a separate deal to sell its stake in Heathrow falters. Ferrovial and co-owner Macquarie have enlisted advisers to sell AGS Airports, which owns and operates Aberdeen, Glasgow and Southampton airports. Bankers at Credit Agricole and Solomon Partners have been tasked with overseeing the process, which is expected to kick off in the coming weeks. A source close to the process said AGS will be sold in its entirety, allowing both Ferrovial and Macquarie to exit. Each owns 50pc of the business. The pair paid £1bn for the company in 2014 but the business is expected to be valued at much more when it comes up for sale. It comes as Ferrovial’s £2.4bn deal to sell its 25pc stake in Heathrow is at risk of collapse, fuelled by a dearth of prospective buyers for the wider business. Saudi Arabia’s Public Investment Fund (PIF) and private equity firm Ardian teamed up to buy out Ferrovial last year but the deal is contingent on other Heathrow investors finding buyers for their stakes after shareholders triggered so-called “tag-along” rights. It means another 35pc stake of Heathrow must be sold for the...