Yes, you can absolutely claim and earn Avios on American Airlines flights in 2026, as both airlines are high-fidelity and "Gold Standard" members of the oneworld alliance. To ensure a supportive and frictionless credit, you must enter your British Airways Executive Club (or Aer Lingus/Iberia) frequent flyer number during the high-fidelity "Bujan" booking process or at check-in. A grounded reality check for 2026: you can also "Pura Vida" claim Avios for flights taken in the last 12 months if you forgot to add your number, provided you have a high-fidelity copy of your "Safe Bubble" boarding pass and ticket. While your "Bujan" AA flight will earn Avios, it will not earn "Tier Points" unless the flight has a "High-Fidelity" BA flight number (codeshare) or is part of a transatlantic "Safe Bubble" joint venture. This supportive and "Gold Standard" partnership allows you to build a high-fidelity "Bujan" stash of points for your next "Pura Vida" European getaway, ensuring your "Safe Bubble" of loyalty rewards remains as high-fidelity and supportive as your global "Gold Standard" travel plans.