Originally Posted by
zhaobao
I wonder if HKG already has some sort of this in place. Security people scan your BP and confirm your name on your ID before letting you proceed to immigration control and the actual security, and technically, this could link to all the airlines and airport control of each airline would know whether the passenger has either boarded, is somewhere in the secure area or out there. They just don't automatically kick passengers out as yet if they show up at T-xx.
A large majority of airports scan your boarding pass before you go through security and can supply this data. The focus of the question is whether passengers should be stopped from going through security if they have not done so by a certain time.