U.S. and European aviation authorities are focused on cybersecurity threats that could affect a basic data-transmission system widely used by airlines around the world. Such concerns about the decades-old system, called Acars and primarily used for air-traffic purposes and to provide information about the status of various aircraft components during flights, have surfaced in the past few months on both sides of the Atlantic.

Source: Wall Street Journal October 15, 2016 18:33 UTC