The codes reveal what kind of airport checks a passenger will face and can be read by smartphones, he says.
It could undermine the US’s PreCheck system which randomly decides which frequent fliers can skip part of the pre-boarding security process.
The barcodes could allow passengers to work out if they had been picked.
Selected travellers are able to avoid having to remove their shoes, jackets and belts. In addition they are allowed to leave their laptops and toiletries in their bags. Full Article