Manchester Airport Holdings Limited, trading as MAG is a holding company which is owned by the ten metropolitan borough councils of Greater Manchester, in North West England, and Australian investment fund IFM Investors. Founded in 2001, MAG is the largest UK-owned airport operator, following the purchase of BAA by Ferrovial in 2006. MAG owns three British airports: Manchester Airport, East Midlands Airport, and Stansted Airport. In the 2017/18 financial year, 58.9 million passengers used MAG airports.

Heathrow Airport Holdings is the United Kingdom-based operator of Heathrow Airport. The company also operated Gatwick Airport, Stansted Airport, Edinburgh Airport and several other UK airports, but was forced by the Competition Commission to sell them in order to break up a monopoly. It was formed by the privatisation of the British Airports Authority as BAA plc as part of Margaret Thatcher's moves to privatise government-owned assets, and was once a constituent of the FTSE 100 Index.