Cobham Aviation Services Australia (formerly National Jet Systems), is a scheduled and charter airline with its headquarters in Adelaide, South Australia.

National Jet Systems (NJS) was established in 1989 and started operations on 1 July 1990. It soon commenced scheduled operations on behalf of Australian Airlines, mainly to tourist destinations in northern Australia, operating a fleet of BAe 146 aircraft under the Airlink brand. After Australian Airlines was taken over by Qantas it continued these operations, and in 2005 commenced operating Boeing 717 aircraft, the operation being rebranded as QantasLink at the same time. The services on behalf of QantasLink are contracted until 2026. In September 2014, Cobham announced it will require at least one Embraer E190 to use on its regional Barrow Island contract.

Cobham Aviation Services provides all crew and engineering support and services for QantasLink's Boeing 717 operations in Australia, and operates freight services for Australian air Express, along with charter services across its regional network for clients such as Chevron Corporation, Metals X, Karara Mining, Westgold and Gold Fields; resource companies that require Fly In/Fly Out (FIFO) services across remote Australia. Cobham Headquarters is at Adelaide Airport, with hubs at Cairns, Darwin, Perth, Brisbane, Sydney, Canberra and Hobart.

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