Like many people, I'm ambivalent about flying. Since September 11, that ambivalence is as much about the way I act when I fly as it is about flying itself. I SPENT MANY years not thinking about flying one way or the other. I'd get on a plane, open my book, and often be glad for the enforced solitude. Whether in school; during years of early travel in Europe and Asia; or on my first jobs in magazine publishing, when eventplanning took me around the United States, flying was a welcome break from the routine.