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.
More top news
Holly has the latest Bank Holiday weekend weather.
The Duchess of Sussex took a great interest in the design.
Pupils at Castle Primary in Portchester dressed up as superheroes to welcome back Harry St Ledger after treatment for a brain tumour