DENVER — Authorities say a Southwest Airlines plane finishing a flight from Baltimore to Denver was parked in a remote area at Denver International Airport Saturday evening because of an unspecified security threat. Airport spokesman Heath Montgomery tells the Denver Post (http://dpo.st/1KFB4Wc) that the passengers were being shuttled to the main terminal by bus. The Post reports that authorities were made aware of the threat about 5:15 p.m.