The Lydd Airport Action Group has been campaigning against the expansion of the airport.
Louise Barton told ITV News it would continue to fight the plans and expected the proposal now to be embroiled in years of legal wrangling.
"The whole nuclear safety argument has been completed disregarded," she said.
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Union members will hold rallies across the UK as part of the strike action over a rejected 1.1% pay offer.
Wednesday morning's weather for the east of the region
Wednesday morning's weather for the west of the region