Passengers flying to the US are being advised to arrive at least three hours before their flight as new tighter security measures come into force from tomorrow.
Travelers will face more vigorous screening, particularly of large electronic devices.
There will also be more security protocols around aircraft and in passenger areas and more sniffer dogs employed.
United Airlines has issued its passengers with an alert about the new security procedures, which have been put in place by the US Department of Homeland Security
Announcing the changes last month, the Homeland Department said the US and the global aviation community face ‘an adaptive and agile enemy’.
"Terrorist groups continue to target passenger aircraft, and we have seen a ‘spider web’ of threats to commercial aviation as terrorist pursue new attack methods," it said.
Airlines have been told to implement increased explosive trace detection screening by tomorrow (July 19) and have 120 days to comply with other measures.
In March, the US banned large electronic devices from cabins on flights from 10 airports – mainly in the Middle East and North Africa. The number of airports in the list has since been reduced.
The new US security requirements, mandatory from tomorrow, are aimed at avoiding the expansion of a laptop ban to other airports.
