On Monday, passengers aboard Delta flight 591 going from Las Vegas to Atlanta allegedly spoofed the onboard Wi-Fi, raising the attention of federal law enforcement. The incident came one day after the DEF CON security conference concluded in Las Vegas, and was first described on social media accounts that follow publicly available air-to-ground messages, known as ACARS. A description of the incident posted to Reddit further stated that these passengers created a fake hotspot (“Delta WiFi Fast”), with a phishing landing page “designed to harvest passengers’ personal credentials.” This technique, sometimes known as an “evil twin” attack, has been long-known to the IT security community. It involves setting up a fake Wi-Fi network and then capturing login credentials and other data.