Pico Iyer's book of essays about international locales contends that the modern world-scurrying citizen, pushed by business demands or political migrations, can easily lose both roots and sense of home. Airports have morphed into cities where scores of languages are spoken, thousands work, and millions travel through mazed villages of McDonalds, massage parlors, and self-help groups that twist along for miles; the Dallas-Fort Worth airport alone grabs more space than Manhattan. And city life is no different: Iyer's apartment building also houses an immigration office, banks, four cinemas, dozens of restaurants and nearly 100 boutiques; the technologically plugged-in businessman with whom he stays has five phones across the world, a dozen international bank accounts, and travels more than a pilot.