For more information, U.S. citizens should consult the Federal Aviation Administration," it added. As of Thursday, the State Department issued a Level 4 advisory for the first time since May 14.

For decades, U.S. officials liked to say the nation’s aviation system was the “gold standard” for safety. A House hearing cast doubt on that assertion.

For decades, U.S. officials liked to say the nation’s aviation system was the “gold standard” for safety. A House hearing cast doubt on that assertion.