He then does something that probably means he’s certifiably crazy. He gets up and strolls up and down the business-class aisle on pretext of using the bathroom, and checks out the people sitting nearby, paying special attention to their luggage, the stuff they’ve jammed into the overhead compartments, the bags under the seats in front of them. He is looking for anything that might contain a Van Eck phreaking type of antenna. It is a completely useless thing to do, because just about any type of luggage might contain such an antenna and he would never know it. Furthermore, any actual spy who had been planted on this plane to eavesdrop on his computer would not be sitting there holding up a big antenna and peering at an oscilloscope. But performing the check (like checking the rates for live data transmissions to the satellite) is sort of an empty ritual that makes him feel vaguely responsible and arguably non-stupid.