Three out of four people in NSW want a second airport for Sydney, a poll has found.
Seventy-six per cent of the 400 people surveyed by Galaxy over the weekend supported a second airport, with only 16 per cent opposed and eight per cent uncommitted.
Federal and state governments have been debating the need for a second site since the Hawke government was warned about Sydney Airport approaching full capacity 27 years ago.
Various locations have been suggested, from Badgerys Creek and Wilton, on Sydney's outskirts, to as far afield as Canberra and Newcastle.
The survey, published in the Daily Telegraph on Monday, found the question of where the airport should be built remains contentious.
Almost a third (29 per cent) wanted an international terminal at Newcastle or on the Central Coast and 23 per cent wanted it at Badgerys Creek.
Federal Infrastructure Minister Anthony Albanese's plan to build a second airport at Wilton in Sydney's southwest was also unpopular - with just four per cent of those surveyed preferring the site.
In March 2012, a joint federal and NSW government study found doing nothing to increase Sydney's airport capacity could have dire consequences.
It recommended proceeding with a new airport at Badgerys Creek and lifting the limit of 80 aircraft movements per hour.
The federal government rejected both recommendations.