A fleet of 737s and 777s are definitely in line for an upgrade, now that the Federal Aviation Administration has ordered airlines to replace their cockpits' displays with ones not vulnerable to WiFi signals. Let's go back a few years to understand what's going on here. See, back when the use of wireless internet aboard airplanes was only just starting to take off, Boeing conducted a test, which discovered that WiFi signals affected 737 and 777 cockpit displays. These screens, which showed pilots important flight data such as altitude and airspeed, flickered and even blanked out completely in the presence of WiFi. In one particular bad test run, the screen remained blank for a full six minutes.