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Given a travel related situation, and given a specific question about the situation, summarize the question into a title

I am traveling from the United States to the UK in a few days, and I will have a checked suitcase. My layover is in Frankfurt, Germany. Since my final stop is in the UK. Will I go through customs in Frankfurt or in the UK? Also, the two legs of my trip will be with the same airline.

Output:
On a trip from US to UK with a layover in Germany, at which point of my journey will I go through customs?