DALLAS — American Airlines says it will start selling “premium economy” service on international flights, with leather seats, entertainment systems and meals.

The seats will cost more than coach but less than business class, although American isn’t stating prices.

American, the world’s largest airline, said Wednesday that it will launch the service late next year with 21 seats on some planes. It seeks to stand out from U.S. rivals and compete with foreign airlines that already offer premium-economy seating.