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The US has announced it will begin profiling US-bound passengers to determine who should get extra screening.
<span style="font-weight: bold">The measures will replace </span>mandatory enhanced screening of all travellers from 14 nations, brought in after the failed attack on a flight in December.
Travellers will be picked out according to how closely they match intelligence on potential terrorist threats.
The new screening strategy results from a review ordered by President Barack Obama.
The Department of Homeland Security says the new measures will use real-time, threat-based intelligence along with multiple, random layers of security to more effectively mitigate evolving terrorist threats.
The US began notifying air carriers on Thursday and the new protocols are being implemented immediately.
Passengers were told to expect increased use of explosives trace detection, advanced imaging technology, sniffer dogs and pat downs.
The measures will apply to US citizens, as well as foreigners travelling to America.
The US government currently has a 6,000 name "no fly" list of suspected terrorists, who are banned from flights to or within US territory.
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