Board Thread:Questions and Answers/@comment-19203513-20150927074914/@comment-26825520-20150929102320

I'd say it depends on the circumstances. If getting AS+ means you have to have one of the carriers a mule, then don't, settle for AS. Sometimes you just need only one more shelling to S some maps.

Now with the aircraft proficiency system, it's a whole lot easier to get AS on some maps. So if you can get AS+ without needing to mule, do it.