Australia's air services regulator has rejected a bid by Qantas Airways and South African Airways to continue their code-sharing alliance on flights between the two countries.
The International Air Services Commission on Friday denied the airlines' request to extend their existing arrangements beyond December 31 this year.
The commission said there was only limited competition for passengers travelling between Australia and South Africa and the code share provided a poor substitute for direct competition.
"The two airlines have an effective duopoly on the main routes [from Sydney and Perth]," the IASC ruling said.
Qantas, which had called for a five-year extension to the alliance, argued in response to an initial ruling in November last year that one or both carriers could withdraw from the route if the partnership did not continue.