Qantas is the national carrier of Australia. They were founded in 1920, making them the 3rd oldest carrier in the world. They began passenger services in 1935. The Qantas name comes from this:
Qantas is based in Mascot, in Sydney, with their main hub being at Sydney Kingsford Smith International Airport. Qantas owns Jetstar Airways, which is a low cost carrier based in Melbourne. They also hold stakes in many other Jetstar brands. They also have a regional offshoot, Qantaslink.
If you would like more information on Qantas, take a look here:
Retro liveries are hugely unrepresented in Infinite Flight, and I believe that this would be a nice livery to have. It would be nice alongside the current Qantas 737 and add to the Australian liveries in Infinite Flight.