Campaigners against the expansion of Bristol Airport said a decision to approve the plan was "disastrous" for the climate and "trashed" democracy.
The proposal has been granted on appeal by the government after being refused permission by the local council.
It was criticised locally, nationally and abroad and was denounced by Greta Thunberg who protested against it.
Bristol Airport chief executive Dave Lees said the expansion was "excellent news for our region's economy".
The plan would allow the airport to increase its capacity from 10 million to 12 million passengers per year.