A security researcher told federal agents he was able to hack into aircraft computer systems mid-flight numerous times through the in-flight entertainment systems, and at one point he caused a plane he was on to move sideways, according to an FBI agent's affidavit. The researcher, Chris Roberts, was questioned upon his arrival at the Syracuse, New York, airport April 15. He had suggested on Twitter while on a United Airlines flight from Chicago that he could get the oxygen masks to deploy or interfere with the cockpit's alert systems, according to the court filing in support of a search warrant for Roberts' laptop and other electronics.