I've heard what Jim said to be the case. In fact, I just did this. But I added a note saying that the new excursion did not affect our already-booked ones. Has anybody booked duplicates because they weren't sure what they wanted? Sounds like something I wouldn't do, but just wondering.

Wendy
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Booked: Uniworld Egypt, 2015
Tauck Amsterdam to Budapest, 2016
Paul Gauguin, Societies & Tuamotus 2016