Actually making it a point to cause as little civilian casualties as possible when striking with air craft. The opposite of this would be to slam two fucking planes into a non-military, civilian filled, place of business, in the middle of New York. Or did we forget about that?
A strtegic air strike is used to prevent the loss of innocent life.
A terrorist air strike is meant to specifically target the innocent. (As Americans, we feel this version is immoral.)