TODers know that flying, for the most part, is a luxury and not a necessity. Well, that's the way it should be, anyhow, but often, there's that pesky matter of business travel. Even academics do a considerable amount of travel, since we have to show our faces at few conferences a year in order to stay current in the field and make sure that our colleagues remember us. In other professions, some businesspeople may get on a plane 2-3 times a week (or more!).