Hi Paul,
Missed this discussion earlier, sorry. As I mentioned in the main thread here about new AW sites, you absolutely can redirect a subdomain, but currently FAA is not doing the lookup at their end correctly, so you end up going to the main FAA site, rather than your AW page. Hopefully this is something that can be fixed by FAA fairly quickly, as there's at least three of us wanting to use subdomains now :)