The threat level for British flights to the US has drooped from severe to high.

英国飞往美国的飞机的威胁程度，从最近严重到高。

youdao

"He wants to have a thorough discussion with the president and the rest of the national security team about whether that does remain the best way to pursue our enemies in Afghanistan, and ultimately bring a level of peace and security there, so that it no longer poses a threat to us,"

VOA: standard.2009.10.01