Although the Federal Aviation Administration and NORAD, the North American Aerospace Defense Command, received kudos from the commission for shutting down the aviation system safely after the terror attacks, many questions remain.

• 尽管联邦航空局和NORAD（北美防空指挥部）在恐怖袭击之后从委员会那里收到安全停飞的指示，但许多问题依然存在。