Originally Posted by
GUWonder
The shoe carnival doesn't exist at all other airports with flights to the USA. Apparently it is possible to have international flights to the USA without the local authorities' security screeners (contracted or otherwise hired by airport/government) having a shoe carnival. That said, it's more complicated when it comes to airports with US CBP Preclearance facilities.
The problem, as you allude to, is that precleared pax originating from DUB or SNN are disgorged at domestic gates on arrival in the USA (and can connect within the same terminal without being rescreened) and the USA won't allow this unless the pax have been screened to US standards.
Postcleared pax need to be rescreened by the TSA before flying on elsewhere.