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Privately held Hooters, based in Myrtle Beach, S.C., and owned by the founder of Hooters restaurants, won't say if it's making money yet, but its employees and passengers seem to be enjoying themselves. Women passengers outnumber men on some flights, and even most of the women say they like the friendly service by Hooters Girls. Naked-Air, a charter carrier organized by a nudist travel service in Houston, won't reveal much at all about itself--except that passengers really are allowed to disrobe once the FASTEN SEATBELT sign goes off. It has made one flight so far, from Miami to the Mexican resort city of Cancun. For passengers venturing back into the air, there has never been a better time to explore the possibilities.