I think ATT is when the trailer is attached on the actual print of Sherlock Holmes and ACC means the trailer is enclosed.
TRAILER FOR CHRISTMAS!!!
Thanks for the news jake088800 
@sammyjankis88
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November 2009
Ok Fantastic i cannot wait 
Great newsPosts: 299
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June 2009
Finally, the trailer will arrive. 
Hopefully the marketing will kick in.
Hopefully the marketing will kick in.
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December 2009
If the trailer's length stands at 1:22 then maybe it becomes more of another teaser. And I bet some really useful plot information will be hidden out there (as was the case in The Dark Knight's Teaser Trailer). Let's hope it provides some fodder for speculation
