Local Pilot's Insight on Hijack Scare

A local airline pilot talks about how a United Airlines flight from Chicago to Minneapolis made an emergency landing in Wisconsin on Friday, May 29th. The pilot used a hijacking alert code, prompting authorities to arrest a passenger who had allegedly tried to enter the cockpit. Was he surprised by the word choice? Is that standard language anytime someone attempts to breach the cockpit? As a pilot, what announcements is he making to assure passengers that they’re safe amid an emergency landing? Why would they choose to land in Madison vs. Chicago? How has the hijacking concern remained present in pilots’ minds post 9/11?