The Federal Government seems certain to approve the construction of a new airport in Sydney.

Decades of planning, protest, speculation and political back-and-forth are expected to come to a head this week, with reports in virtually all media outlets claiming Badgerys Creek will be the site of the second Sydney airport.

Intense campaigning by businesses and unions for the job-creating project has slammed into equally intense opposition by locals over the years.

In the last year or so, the Western Sydney Airport Alliance (comprising unions, businesses and some community groups) has taken its push for the airport to new heights.

The Alliance says the time is now, and the green light will be given by the Government's infrastructure sub-committee and the Cabinet.

The project will not just be a few terminals and a landing strip; it will require significant government investment for road upgrades, rail links and related services.

Investigations made in recent years have suggested the airport project would create around 20,000 jobs for the area, and cost somewhere in the hundreds of millions to build.

Local Mayor Ned Mannoun told the ABC that the airport should be built sooner, rather than later.

“I think people are sick and tired... they want a decision made and they want construction to start ASAP,” he said.

“If this were to get delayed and wait another five years and keep on talking about it, there is a chance that people will start saying no we don't want this anymore, because more and more people are moving into the area.”