The US airline that is primarily affiliated with Qantas is American Airlines. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK) Both airlines are founding members of the oneworld alliance and have a close partnership that includes codeshare flights and shared frequent flyer benefits. 

Other Qantas US partners include: 

• Alaska Airlines: Another oneworld alliance member that partners with Qantas, especially on routes from the US West Coast. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK).
• JetBlue
• Hawaiian Airlines 

How the American Airlines-Qantas partnership benefits travelers

• Codeshare flights: American and Qantas sell and operate codeshare flights, making it easier to book connecting travel between the US, Australia, and New Zealand.
• Frequent flyer programs: Members of American's AAdvantage and Qantas Frequent Flyer programs can earn and redeem miles or points when flying with either airline.
• Status benefits: Frequent flyers with elite status can enjoy reciprocal benefits, such as lounge access and priority boarding, when traveling on eligible flights. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK).

For further travel planning, would you like me to find out about specific routes or frequent flyer program benefits for either American Airlines or Qantas?