Following a complaint that airport charges set by Aarhus Lufthavn A/S might constitute State aid to Ryanair, the European Commission has opened a formal investigation. The complaint alleges that the operator of Aarhus airport in Denmark granted State aid through discriminatory rebates on airport charges to certain airlines, including, but not limited to, Ryanair. In order to determine whether Aarhus Lufthavn A/S sets its airport charges independently from the public authorities, the Commission has also adopted an injunction requesting further information necessary to carry out a proper assessment of certain allegations made by the complainant.