It is considered polite to light a match after passing gas. But not while on a plane.

An American Airlines flight was forced to make an emergency landing Monday morning after a passenger lit a match to disguise the scent of flatulence, authorities said.

The Dallas-bound flight was diverted to Nashville after several passengers reported smelling burning sulfur from the matches, said Lynne Lowrance, spokeswoman for the Nashville International Airport Authority. All 99 passengers and five crew members were taken off and screened while the plane was searched and luggage was screened.

The FBI questioned a passenger who admitted she struck the matches in an attempt to conceal a "body odor," Lowrance said. She had an unspecified medical condition, authorities said.

"It's humorous in a way, but you feel sorry for the individual, as well," she said. "It's unusual that someone would go to those measures to cover it up."

The flight took off again, but the woman was not allowed back on the plane. The woman, who was not identified, was not charged in the incident.