 The FAA had issued a ground stop for all American Delta, United flights and other airlines as well. That ground stop being lifted for some airports. New York City's chief technology officer, Matthew Frazier, said the problem had originated with an update that the Internet security firm CrowdStrike had put out overnight. That update, once deployed, caused a number of Windows-based workstations to go offline or crash. CrowdStrike says it was not a cyber attack and that it's being worked on now. This is ABC News.