Luton Airport looks set to be sold for around £400m.
The airport handled 9.6 million passengers last year and will be, subject to regulatory approval, Aena's fifth largest airport.
Aena executive chairman Jose Manuel Vargas said: "We aim to substantially build up Luton in consultation with all its stakeholders."
More top news
Norwich Cathedral's Peregrine Falcon has hatched its first chick this year - three more are expected within the next few hours
A man has been charged with murder in connection with the death of a man in Hitchin.
The Luton-based airline easyJet has banned the sale of nuts on its flights.