The cause was an outage in the FAA's notice to air missions computer system or NOTAM.

原因是美国联邦航空局的空中任务通知计算机系统(NOTAM)出现故障。

Now, the specific system experiencing the outage is called " the notice to air missions" which alerts pilots it's about closed runways, equipment outages and potential hazards along a flight route or at a location that could impact flight.

遭遇故障的系统名为“空中任务通知”，它会提醒飞行员跑道关闭、设备故障以及可能影响飞行的飞行路线或地点等潜在危险。