[Answer] The first international passenger air service traveled along which route?

Step 1 : Introduction to the question "The first international passenger air service traveled along which route?"

...Air Transport & Travel Ltd (AT&T) operated this flight path starting in 1919, and it was the first to depart daily. It carried passengers as well as mail and packages between England’s capital and the French capital.

Step 2 : Answer to the question "The first international passenger air service traveled along which route?"

London to Paris:

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