Originally Posted by
metsfan1962
If one preclears U.S. Customs/Immigration in YYC, when the flight arrives in the U.S., is it necessary to exit and go through a security checkpoint once again before going to your connecting flight? U.S. arrival city is DFW, if that makes a difference.
The answer has little to do with YYC. You'd best find someone that knows DFW well. But in general, a pre-screened flight arrives as a normal domestic flight would. So unless you are changing terminal etc it shouldn't be required.