Over the past 12 months, the two largest airline groups, Qantas and Virgin, consistently accounted for about 95 per cent of the domestic passenger market, Australian Competition and Consumer Commission data show. Within the duopoly the flying kangaroo is dominant. The ACCC reports Qantas secures between 70 and 90 per cent of all profits. Grattan Institute analysis shows the domestic airline industry is one of the two most highly concentrated sectors in the already monopolistic Australian economy. Higher than the banks, supermarkets, internet service providers, news media and insurance companies. Passengers pay the price The commission, which until recently had…