Homeland Security Secretary Jeh Johnson said the United States also would review its assessments of certain foreign airports and offer them help with security, as well as take other measures, "both seen and unseen."
It came amid growing evidence that the plane that crashed Saturday in the Sinai, killing all 224 people, was brought down by an explosion.
Sources close to the investigation told AFP that information from the airliner's flight data and voice recorders "strongly favors" the theory that a bomb exploded on board the Airbus A321.
Johnson noted that the facts and circumstances surrounding the crash were still under investigation, although US President Barack Obama on Thursday acknowledged the "possibility that there was a bomb on board."
Johnson described the US actions as "interim, precautionary enhancements to aviation security with respect to commercial flights bound to the United States from certain foreign airports in the region."
He said expanded screenings would be applied to items on aircraft, airport assessments would be enhanced in conjunction with US international partners, and offers of help would be made to beef up aviation and airport security.
"At this time these security enhancements are intended only for certain foreign airports in the region," he said in a statement.
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