You can use FJ (Air Pacific) only on the Global explorer fare. Call Qantas in the US to double check.

The problem and confusion all this is causing is that different countries have different definations of the Global explorer and OneWorld RTW fares. On the Global Explorer, it is based on mileage. On the 1W , it is based on Continents. And certain countries can only market one product, and some both. And the Global Explorer fare have different classification in certain markets too. eg In UK and Australia, it is marketed only in economy class whereas in HongKong, you can buy it in Business and First class as well.

Your best bet is to consult a professional travel agent who would be able to offer you accurate advice on the fares.