Upvote:1
At the airport you land/enter first.
So for you this would be at the Dallas airport.
Upvote:9
Dallas.
If the final destination is in the U.S. and the first port of arrival is in the U.S., travelers must clear immigration and customs at the first port of entry. If a connection is involved, the traveler will not be required to go through another clearance when they arrive at their final destination
.