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. Although the claims are still being investigated, the airline involved, United, cast doubt on whether it was possible to control an airplane through the entertainment system, while other experts said such cyber threats should be taken seriously given that airplanes are increasingly connected to the Internet. The researcher, Chris Roberts, was questioned upon his arrival at the Syracuse, New York, airport April 15.Read more on NewsOK.com