FBI investigates bomb threat in plane's lavatory (AP) GRAPEVINE, Texas - FBI agents are interviewing passengers and crew of a United Airlines flight that landed at Dallas-Fort Worth International Airport after the crew found a written bomb threat in the lavatory. A FBI spokeswoman says the plane was inspected and cleared after being moved to an isolated part of the airfield. The regional jet, flight number 5394, had 62 passengers and four crew members on board when it landed just before 3 p.m. Friday en route from Los Angeles. FBI spokeswoman Beverly Esselbach says there'll be several hours of interviews. A statement from the airport said the incident did not cause delays or the cancellations of other flights.