After the ASA referred one of the airline's ads to the OFT on the grounds that it was misleading, Ryanair retaliated by sending a formal complaint that the ASA had "demonstrated a repeated lack of independence, impartiality and fairness" in rulings against it. The ASA has ruled against nine of the airline's ads in the past two years.
The Week: Advertising news - Ryanair and ASA clash
Ryanair and the Advertising Standards Authority have submitted complaints about each other to the Office of Fair Trading.