MV, you're correct that SBAE has 3 months in which to mount a challenge. The whole situation is strange. The Administrative Court can extend the time period in exceptional circumstances, but they have to be truly exceptional. The three month time period runs from the date of knowledge of the action which an individual wants reviewed. They can only challenge the decision of a public body and not the actions of the airport itself, as it is a private business. Now unless they have recently discovered an irregularity with the planning process, that all parties are keeping quiet about, I would say their application is dead in the water.