Old Dec 19, 18, 9:50 am
Join Date: Sep 2010
Location: Las Vegas
Programs: BA Gold; Hilton Honors Gold
Posts: 1,532
One thing to be aware of is that if you have PreCheck and you are selected for additional security screening at LHR then you will almost certainly not get PreCheck on any subsequent AA operated flights in the USA that are on the same booking, and your boarding passes for those flights may be marked SSSS even though the security screening took place at London.

By way of an example, I was flying LHR - DFW and was selected for extra screening at LHR. My onward AA boarding passes also had SSSS on them. By going to a kiosk at DFW and re-entering my KTN and reprinting the boarding passes the SSSS was removed and PreCheck was once again available.

The fact that the AA terminal at DFW has certain security lines that don't always participate in PreCheck is another thing altogether. The reverse is true at SEA where they have at least one checkpoint that is PreCheck only!
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