A well-known U.S. hacker told F.B.I. agents he took momentary control of an airplane’s engines mid-flight by hacking into its inflight entertainment system, according to a document filed in U.S. federal court and obtained by APTN National News. Roberts, who has been interviewed at least three times by the F.B.I. this year, is under investigation for allegedly hacking into the electronic entertainment systems of airplanes, according to an application for a search warrant to probe seized electronic equipment. The document shows F.B.I. agents investigating Roberts believe he has the ability to do what he claims: take over flight control systems...