AA and UA allow OW awards at half-price in miles, and AA has reduced rates (20k instead of 30k for economy transatlantic during the off-season. In addition, you can use AA miles to fly on IB (via Madrid), but IB award flights don't show online and must be booked on the phone. You can check IB schedules online and then phone to see if the flights you want are available for award travel. You can also make use of AB if you fly through Germany.