路透3月11日 - 据路透看到的一封信称，美国国家运输安全委员会将于周二宣布，它将提出一项紧急安全建议，防止在华盛顿里根国家机场使用两条跑道时进行直升机作业。
(为便利非英文母语者，路透将其报导自动化翻译为数种其他语言。由于自动化翻译可能有误，或未能包含所需语境，路透不保证自动化翻译文本的准确性，仅是为了便利读者而提供自动化翻译。对于因为使用自动化翻译功能而造成的任何损害或损失，路透不承担任何责任。)
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