We haven't made reservations yet, but it looks like from DFW, we would need to connect through JFK in New York, London Heathrow, or Madrid. Some of the connection times are short, (1-3 hours).
With the last two choices, I'm sure that we'd have to go through customs in DFW. What about if we go through JFK? Would we go through customs in DFW or JFK or both?
If we go through Heathrow or Madrid, Do we have to go through customs at both DFW and the connecting airport?
We're trying to figure out so that we choose flights that give us enough time to connect.
Thanks.