well as it stands industrial relations is handled by the state governments. But since Johnny howard wants to make award rates come under federal power as part of his IR reforms then you may find award rates for pilots will be binding across the country (although I very much doubt this system will leave us any better off)
Otherwise the only way for the award to be recognised as common law would be for the remaining state governments to rule them as such. I wouldnt be holding my breath waiting for that to happen though thats for sure.