Originally Posted by
layz
So when did SFO/LAX/JFK/etc trust LHR security?
The point is about reciprocity (or lack of such being implemented), right?
The EU Schengen country of Germany is fine allowing UK-screened flight passengers to transit Germany without being rescreened in Germany. The Germans are also fine with not rescreening US-screened flight passengers transiting in Germany. But neither the UK nor the US reciprocate in practice with Germany because of a combination of factors -- factors which include but are not limited to differences in airport layouts and in how arriving passengers (may or may not) mingle and are processed for passport control and customs control purposes.