Apologies, @japsas100, I don't know AIX. And I'm trawling the back of my memory here, as I haven't worked with a UNIX system for quite a while. But in the permissions set, as well as the RWX flags there's also the setuid/setgid ones, which can be applied to user or group permissions with "+s". Once it's applied it appears as an "s" instead of the "x".
Doing some real memory dredging, I think with the setfacl command for Solaris, you can also have default entries in ACLs, and I think they set the ACLs for any directory contents which are created. So you might get an equivalent with AIX. But I'll have to defer to other more knowledgeable, and more recently experienced folk to confirm what I'm saying, or not.
@Kurt_Bremser can you help here?
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