Recital 20 of the Preamble of Council Directive 96/67/EC of 15 October 1996 on access to the groundhandling market at Community airports establishes that an airport may not subsidize its ground-handling activities from the revenue it derives from its role as an airport authority. COUNCIL DIRECTIVE 96/67/EC of 15 October 1996 on access to the groundhandling market at Community airports, http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31996L0067:EN:HTML