IATA (the International Air Transport Association) requires airlines to digitally sign the data in the 2D barcode, but only when used on the screen of a mobile

IATA (the International Air Transport Association) requires airlines to digitally sign the data in the 2D barcode, but only when used on the screen of a mobile device. That won't make a difference until they add the requirement to paper boarding passes (or phase out the paper boarding passes). And this all begs the question of whether checking IDs does anything for security.