In short:

The first commercial flight from Western Sydney International Airport (WSI) to the Gold Coast took off just before 11:30am on Sunday.

Located 45 kilometres from Sydney's CBD, WSI in Badgerys Creek is open 24/7.

WSI's CEO Simon Hickey says the airport has been designed for growth, and that in the 2060s it could reach its full 82 million passenger capacity per year.