An American Airlines flight landed at Kansas City International Airport Sunday after concerns about a suspicious object on board.Flight 26 was heading from San Francisco to New York's JFK Airport when it landed at KCI. There were 227 passengers and crew members on board the plane at the time.Airport spokesman Joe McBride said the suspicious object was a flash drive that was found in one of the plane's lavatories.The plane has been isolated on a taxiway away from the terminal. The passengers have been forced to wait in Terminal C."I think it's a little ridiculous for a flash drive," said passenger Steve Banning. "I suppose it could be rigged."Investigators said they would complete a full search of the plane before allowing the flight to resume.According to McBride, investigators determined the threat was unfounded and the passengers reboarded the flight around 6:30 p.m. Sunday