I don't think it's just possible to turn off the tap immediately. Thousands of people have to be informed even IF the procedures are in place. Airports are huge logistical centres spanning several timezones, many organisations and private companies. Not to mention the massive changes to several different computer systems, privately owned and otherwise, that have to be coordinated and synchronised. They need at least a little warning to try to get everyone on the same page at the same time......
It can't be just "snap" and it's done. That's just not realistic at all.
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