A decision on whether Stansted Airport must be solved could be resolved on Thursday at the Court of Appeal.
In 2009 the Competition Commission (CC) ruled that BAA must sell Stansted in Essex and two of its other UK airports.
BAA is challenging the ruling.
BAA has mounted a series of legal challenges against the decision, all have been unsuccessful.
The latest blow came earlier this year when Spanish-owned BAA lost an appeal before the Competition Appeal Tribunal.
The action is before Lord Justice Mummery, Lord Justice Rimer and Lord Justice Sullivan.
BAA has sold Gatwick Airport in West Sussex and faced with having to dispose of either Edinburgh Airport or Glasgow Airport, it has opted to sell Edinburgh.
The judges reserved their ruling and are expected to give a decision on the appeal on Thursday.