Security is being tightened at airports with direct flights into the US - including some in the UK - in response to US warnings of a "credible threat".
UK Transport Secretary Patrick McLoughlin said the measures were being taken to keep the public safe.
While he would not specify what steps would be involved, he ruled out "significant disruption" to passengers.
It comes amid US media reports that al-Qaeda affiliates in Syria and Yemen are developing bombs to smuggle on planes.
A US Department of Homeland Security (DHS) official said the changes were a response to a "real time" and "credible" threat, but he could not comment on specific intelligence matters.
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