Darwin airport to double in size DARWIN International Airport will begin work on a $60m expansion at the end of this month aimed at accommodating future growth in air services. Airport chief executive Ian Kew said work would begin on May 24 on upgrades that would include a $42.5m terminal expansion, the biggest since the terminal opened more than 20 years ago, aimed at doubling its size from 16,000sq. m. to 27,000 sq.m.