A commercial flight that took off from Newark Liberty International Airport on Wednesday morning had to be diverted to Chicago due to a “security issue,” federal officials said. United Airlines flight 1533 was en route to Los Angeles but made an unplanned stop at Chicago O’Hare International Airport at about 7:40 a.m, the Federal Aviation Administration said in a brief statement. Someone found a note in the bathroom saying the plane would explode, according to CBSNews.com. A police K-9 found a suspicious bag, which a robot moved away. A passenger on the flight got into a skirmish with members …