Balanced News: US flights grounded because engineer accidentally ‘replaced one file with another’

With the Federal Aviation Administration’s Notice To all Air Missions, or NOTAM, system back up and running, staffing remains high and systems monitoring is at an urgently high level this morning, a senior official told ABC News Thursday. At the same time, public and media computer traffic on the NOTAM system is running high because of global interest in the antiquated system that crashed on Wednesday. As the systems began showing problems and ultimately failed, FAA staff feverishly tried to figure out what had gone wrong.