Where to get information on FAA AIXM 5.0 versions of Special Activity Airpace (SAA) files? Does anybody know where to find documentation or someone to ask questions about the SAA database provided by the National Flight Data Center? I have some questions about the ambiguity of some of the data.

Or better yet, is there a better source for the boundaries and meta data for special-use airspace?
One possibility is to contact the FAA National Flight Data Center (NFDC). They provide information as part of the US Aeronautical Information Services (AIS).

NFDC Support Desk email is available on this login page, below the login data boxes.

See also this question: Where to find a waypoints/fixed points, navaids, airports database for other aeronautical data sets in case you need them too.