People travelling to and inside the US are already starting to feel the impact of new airport security measures that have come into force.
Procedures that specifically target foreign passengers include full-body screening with imaging machines. Officers are also patting down more travellers by hand.
Extra checks are also being imposed on people whose name is on a so-called US watch list.
Steve Lott, a spokesman for the International Air Transport Association, said: “Instead of looking for dangerous objects like toenail clippers and rogue bottles of shampoo, we should be looking for bad people. We should be using intelligence to target bad people around the world who may be wanting to cause harm to airlines or interests around the world.”
Some may be annoyed about the longer queues at airport security, but others seem to approve.
One traveller said: “They basically take you through and they pat you down. It’s almost back to what it was post 9/11, I think.”
Another said: “There are people doing silly things on airplanes, so it just gives you a little extra level of comfort to know they’re making a little effort.”
Travellers from 14 countries including Nigeria, Yemen, Pakistan, Afghanistan and Saudi Arabia face the full-body pat downs.
President Obama is meeting his security chiefs and is due to make an address later today.