American Airlines is adding more premium seats to its Boeing 777-300ER planes used on long-haul routes to improve profitability as US carriers increasingly chase higher-spending travelers ▻ ↧ American Airlines boosts premium seating on 777 jets as carriers ch... American ​Airlines is adding more premium seats to its Boeing 777-300ER planes used on long-haul routes as U.S. carriers ‌increasingly chase higher-spending travelers.