They have said from the beginning youu should register at least 72 hours before your travel but arrangements would be made for urgent cases where immediate travel is regquired.
The trouble is you may know you have no reason to be refused ESTA approval but if your name and details register as a person of interest if someone has similar details it could hold up proceedings.
Airlines at present are fined for those who are refused entry which is why they do try as far as possible to comply but not sure why they should be forced to do extra work to polica another countries immigration policy? If you think of the numbe of countries involved and systems around the world it must be very hard to cross check everything.
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