On 6 July 2009, the Competition Appeal Tribunal (CAT) granted Ryanair permission to intervene, on the side of the Competition Commission (CC), against BAA's appeal of the CC's decision in its BAA Airports market investigation. In December 2008, the CC ordered the sale of Gatwick, Stansted and either Glasgow or Edinburgh airports. The CAT was not swayed by arguments by BAA's legal counsel that if Ryanair were allowed to intervene it would effectively be an "officious bystander". The CAT considered Ryanair to have a sufficient legal interest in the matter since it is BAA's main customer at Stansted and a major customer of other BAA airports. A hearing for BAA's appeal has been set for 19 October 2009.