Australian-based Regional Express Airlines (ZL), also known as Rex, is the country's largest regional airline. The airline flies to about 58 destinations within New South Wales, Queensland, South Australia, Tasmania, Victoria and Western Australia. Its entire fleet is configured with Economy Class seating. The airline has operating bases located at Adelaide Airport (ADL), Melbourne Airport (MEL), Sydney Airport (SYD), Townsville Airport (TSV), Perth Airport (PER), Cairns Airport (CNS). The airline also operates Rex Lounges at the Sydney, Melbourne and Adelaide Airports.