ADP is responsible for the operation and development of
14 airports including Paris-Charles De Gaulle, Paris-Orly and Paris-Le Bourget.
GA's appointment adds fuel to recent speculation that the French government is to sell off ADP as part of a programme of denationalisation, which has taken place in France over the past few years.
GA London CEO Fergus Wylie is co-ordinating from London international comms for the privatisation, which is likely to take the form of a stock market listing. GA Paris CEO Fabrice Baron also leads comms efforts for ADP.
The French government is floating between 24 per cent and 29 per cent of ADP's capital, which would raise up to €870m (£604m). The rest of the French state's shareholding in ADP will be gradually sold off.
The French government recently awarded ADP a five per cent increase on airline tariffs, worth an extra annual €30m (£21m) in revenue.
ADP handled six million passengers at Paris-Orly and Charles de Gaulle airports in January, a 4.6 per cent increase on 2005.