w e b 77The 777-300ER (ER for Extended Range) is the B-market version of the 777-300. It features raked and extended wingtips, a new main landing gear, reinforced nose gear, and extra fuelFind the best seat wiht our American Airs Boeing 777-300ER (77W) seating chart. Use this seat map to get the most comfortable seats, legroom and rec before booking.