The group, France's third-largest builder behind Vinci and Bouygues, had bid for the airport contract in order to diversify its income from its APRR and AREA toll road concessions, which expire by 2036.

Financial terms were not disclosed for the deal, which includes work to renovate and expand the airport.

The Lille airport contract had attracted rival bids from Vinci and the regional Chamber of Commerce, which leads the consortium currently running the facility under a 10-year deal that expires at the end of 2019.

(Reporting by Laurence Frost; Editing by Elaine Hardcastle)