I haven't flown on Sept. 11th since I went back to teaching. It's in the second week of the fall term at my U.S. university and a bad time to be away. However, if I had a reason to, the date wouldn't affect my plans either way. It'll probably be a nice early spring day in most of Australia ... and a good time to be in France, after most of the tourists have gone home.
(Ah, retirement. Maybe I should post this in the Seniors Travel thread.)