My last Citi AA was closed almost 2 years ago. Specifically, TransUnion and Equifax agree that it was closed 2015-08-30. The Citi website, on the other hand claims it was closed 2015-09-08.
I'd have no problem with waiting until the 9th to apply for a new Plat, except that I will be leaving the country on the 12th, which would make phone calls, if needed, a pain. Would it be safe to assume that the earlier date is correct? I just don't know.
I will be downgrading my Prestige and reducing its CL before then, so perhaps I can safely assume they won't need a call...