The US has unveiled tough new measures to enhance security on flights entering the country, but has held off extending a ban on laptops in the cabin.
In March the US banned cabin laptops to and from eight mostly Muslim nations, fearing bombs may be concealed in them.
The new measures require enhanced passenger- and electronic-device screening across 105 countries.
Airlines have 120 days to comply or could face a ban on carrying all passenger electronics.
They could even be denied the right to fly into the US.
Homeland Security Secretary John Kelly spelled out the new measures on Wednesday, saying: “Make no mistake: our enemies are constantly working to find new methods for disguising explosives, recruiting insiders, and hijacking aircraft.
“We cannot play international whack-a-mole with each new threat. Instead, we must put in place new measures across the board to keep the travelling public safe and make it harder for terrorists to succeed.”
The new measures, which Mr Kelly said would not be the last, include:
Enhanced overall passenger screening, Heightened screening of personal electronic devices, Increased security protocols around aircraft and in passenger areas
Expanded canine screening.
The measures are vague on specifics in terms of operational application, but will cover 280 airports and 180 airlines, affecting an average of 2,100 flights a day, carrying 325,000 passengers.