Lee, I can't confirm one way or the other, but my research points toward it not being available that late. Last year's final Tracy Arm excursion was apparently on the August 27 cruise. I don't know how flexible they are based on local conditions as of early September, or if they have a set schedule they don't vary from. (Aside from the weather, they may lose a lot of their seasonal help after the end of August.)

You could try calling Regent, although I'm not sure the reservation agents there will know whether there's any chance this will be offered. From what I've read, the company Regent uses for this tour is Allen Marine; you might call them (1-888-289-0081)or email them (Juneauinfo@allenmarine.com) just to ask if there's any possibility they'll still be doing a Tracy Arm trip on September 12. If they tell you there's zero chance of that happening, then at least you'll know for certain.

-- Eric