JL used A for awards prior to joining OW (not a revenue fare code), and has not yet finished many of their OW integration changes (July 1 looks to be the current target). So the lack of A is one of the in-process but unfinished changes. You have to phone and request A to be released, it is never available automatically at this point.

There was a thread a few months back speculating about how JL would handle the (many) incompatibilities with OW fare codes, and now we know the answer: badly.