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

On a trip from US to UK with a layover in Germany, at which point of my journey will I go through customs? - Focused young man pointing at map while searching for route with multiracial friends in Grand Central Terminal during trip in New York

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.






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On a trip from US to UK with a layover in Germany, at which point of my journey will I go through customs? - Customer paying for taxi service in dollars
On a trip from US to UK with a layover in Germany, at which point of my journey will I go through customs? - View through open window of unrecognizable driver accepting payment in cash from crop customer sitting on back seat
On a trip from US to UK with a layover in Germany, at which point of my journey will I go through customs? - Amazed young multiracial male and female friends in casual outfits looking away while exploring map in Grand Central Terminal





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