Heathrow Airport Holdings (formely BAA Ltd.) is a Spanish company who operates six British airports (including Heathrow Airport) and Naples Airport in Italy, making the company one of the largest transport companies in the world. BAA comes from British Airports Authority and is owned by a group led by Grupo Ferrovial, a Spanish firm specialising in infrastructure. The company's head office is in The Compass Centre on the grounds of London Heathrow Airport in the London Borough of Hillingdon.