CHARLESTON, S.C.—On my connecting flight from Atlanta to Columbia, S.C., I sat next to a man who was very musty. But it wasn’t in-your-face musty. It was that type of musty that whisks under your nose when someone walks by the person carrying the offensive odor. On a scale of 1 to 10, this man was around 8. There should be some FAA guidelines barring people too funky to fly because my lungs certainly felt violated during our 40-minute flight.