The warrant describes how Roberts would wiggle and squeeze the Seat Electronic Box under his seat, which connected to the plane's in-flight entertainment system, or IEF.

The warrant describes how Roberts would wiggle and squeeze the Seat Electronic Box under his seat, which connected to the plane's in-flight entertainment system, or IEF.
He would then connect a cable to the box and connect it to his computer. From there, Roberts was able to hack into the plane's IEF system using default IDs and passwords.
http://www.usatoday.com/story/tech/2015/05/16/chris-roberts-fbi-plane-hack-one-world-labs/27448335/