在持续近五小时的全国性停飞后，美国航班已恢复。然而，官员警告称，从与该事件相关的持续延误中恢复过来将需要数天时间。
US: What exactly caused the longest nationwide ground stop in 25 years? Issued on: After a nearly five-hour ground stoppage, flights in the US have resumed. However, officials are warning that it will take days to recover from the ongoing delays related to the incident.
交通部长肖恩·达菲解释称，这场危机是由于老化的电信设备故障导致的。究竟发生了什么？请听法广国际事务编辑希尔利·西特邦的解答。
Transport Secretary Sean Duffy explained the crisis was due to a failure in ageing telecommunications equipment. What exactly happened? Answers with FRANCE 24 international affairs editor Shirli Sitbon.