The flight tracking website "Flightradar24" announced in its live report that at the same time as the US Federal Aviation Administration implemented the order to stop flights, which began at 20:54 UTC, there are 3,100 planes in the sky heading for US airports, and currently there are no new flights. According to this site's data, the last recorded flights before the full stop at several major US airports include Denver at 1:38 p.m., Chicago O'Hare at 2:15 p.m., Houston at 2:39 p.m., New York (John F. Kennedy and Newark) Washington at 15:35, Miami at 15:36 and Atlanta at 15:37 local time. The US Federal Aviation Administration (FAA) previously announced that all flights were suspended due to a temporary communications blackout as a precaution, and the FBI, which dismissed the possibility of a cyber attack, placed the investigation into the role of a "software update" in this widespread disruption.