Police swarmed a plane after a "threatening" note was found in the aircraft's toilet. The Frontier Airlines flight was travelling from Denver, Colorado, to Dallas-Fort Worth, Texas, when the incident occurred, and it landed safely in Dallas. Frontier Airlines told The Mirror: "On Monday, November 3, as Frontier flight 1324 was en route from Denver International Airport (DEN) to Dallas Fort Worth International Airport (DFW), a crewmember discovered a threatening note in a… (www.msn.com) More...