Final answer:
The sixth scale degree of an A-flat major scale is D-flat.
Step-by-step explanation:
The sixth scale degree of an A-flat major scale is D-flat. In A-flat major scale, the notes are A-flat, B-flat, C, D-flat, E-flat, F, and G. The sixth scale degree is D-flat, which is three whole steps above the tonic note A-flat.