The move will allow stood-down workers to return and comes days after Qantas announced it would add 300 more return flights per week by the end of June.
The first estates are due to open from the middle of next year and the project will create 5,200 jobs during construction and 17,000 upon completion.
Australian F-35A pilot Flight Lieutenant Adrian Herenda was in the cockpit of A35-001 as the clock ticked over the milestone.
The news comes a week before the third deadline to decide the winning bidder for Virgin, which has already been whittled down to two parties: Bain Capital and Cyrus Capital Partners.
Now the country is in ‘Alert Level 1’, passengers will now be able to eat hot food in the airline’s lounges, and unaccompanied minors can travel domestically again.
New Zealand’s Winston Peters has said his country has run into Australia's "roadblock of federalism" and shouldn't be held back by "slowest mover" states.