Tiger Airways Australia Pty Ltd, operating as Tigerair Australia, is an Australian low-cost airline. It commenced services in the Australian domestic airline market on 23 November 2007 as Tiger Airways Australia. It is a fully owned subsidiary of Virgin Australia Holdings. The airline is based in Melbourne, Victoria, with its main base at Melbourne Airport. The Civil Aviation Safety Authority of Australia (CASA) grounded the airline in 2011; as a result operating bases at Adelaide and Avalon were shut down and it initially only operated out of its Melbourne base after returning to the air. On 7 March 2012, Tigerair announced the reopening of a second base at Sydney Airport.