There was a programme on the BUFF on Discovery Wings last night. Apparently ailerons would cause twisting of the wings due to their span, and hence change the AoA, so spoilers were used instead. Also said that the B52 might still be flying in 2030! Some of the shots of low level manouvring were fantastic. It was amazing to see something so big fly so nimbly. With the wing span, you were waiting to see the wings snap off in some of those turns!