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10 August 2006 -- For Travelers to the United States
Transportation Security Administration implements security measures in wake of serious terrorist threat
In response to a serious terrorist threat to international aviation security, the Secretary of Homeland Security has elevated the Homeland Security Advisory System Threat Condition to Severe, or Red, for all commercial flights from the United Kingdom to the United States, and to High, or Orange, for all other international flights and all domestic commercial aviation. more

Statement by Homeland Security Secretary Michael Chertoff Announcing a Change to the Nation’s Threat Level for the Aviation Sector more

http://www.20min.ch/news/ausland/story/21395919
http://news.bbc.co.uk/2/hi/uk_news/4778575.stm

All airports have been put under the restrictions

Reid statement
A terrorist plot to blow up planes in mid-flight from the UK to the US has been disrupted, Scotland Yard has said.

"High security is causing delays at all UK airports, Heathrow is closed to incoming flights, and MI5 has raised the threat level to critical"