The skies were less than friendly for Clay Aiken, who had a run-in with a fellow airline passenger on July 7.

The 28-year-old singer was on a Continental Airlines flight to Tulsa, Oklahoma, where he was scheduled to perform that evening at the Brady Theater.

FBI Special Agent Gary Johnson said there was a dispute between a male passenger and a woman on the flight, but would not identify either party. He said the conflict arose over the male passenger's foot resting on the woman's armrest.

The flight crew intervened after the woman allegedly gave the male passenger a "minor shove" during the argument. Tulsa Airport Authority spokeswoman Alexis Higgins said the passengers were held until FBI agents arrived to interview them.

No injuries were reported and no arrests were made.

Concertgoers who attended Aiken's show said afterward he joked on-stage about being beaten up by a girl earlier in the day.

Aiken's publicist and manager in Los Angeles did not return telephone calls and e-mails seeking comment placed July 8 by the Associated Press. The runner-up in the 2003 season of American Idol, Clay Aiken is the third most commercially successful contestant in the show's history. Only Kelly Clarkson and Carrie Underwood have sold more albums.