But until the backlog of flights in the air could be reduced, ATC had ordered further delays of outbound traffic.

在上空滞留的飞机没有减少之前，空中交通指挥塔台已命令往外飞的客机继续推迟起飞时间。

youdao

These are the impediments to the movement of people and goods brought on by Sept. 11: the wasted hours of employees showing IDs to get into their building, the delays at the airport, the backlog of trucks at the border, the increased cost of air freight, the dead weight of higher insurance premiums.

FORBES: The Detour Economy

These are the impediments to the movement of people and goods brought on by Sept. 11: the wasted hours of employees showing proof of identification to get in their building, the delays at the airport, the backlog of trucks at the border, the increased cost of air freight, the dead weight of higher insurance premiums.

FORBES: The Detour Economy