A USAir flight from Philadelphia to Los Angeles was diverted to Dayton, Ohio, after a passenger said he had a bomb, the FBI said. Agents arrested Richard Allan Josephson, 37, of Wilmington, Del., and charged him with making a bomb threat, said FBI agent James Samples. If convicted, he faces up to 20 years in prison. WHIO-TV in Dayton quoted an FBI affidavit as saying that Josephson mentioned a bomb when he handed a bag to a flight attendant. No bomb was found on USAir Flight 17--with 109 people aboard--after it landed without incident, but eight people got bumps and bruises evacuating on an emergency slide, an airport spokeswoman said.