The first regular air mail route in the United States was established on 15 May 1918 between New York City and Washington D.C. And was 218 miles long. This service was the the exclusive responsibility of the Post Office until 12 August 1918 when the United States War Department joined the Post Office to furnish the planes and pilots.

The correct answer to this open question is the following.

There is no question here, just a statement.

If this is a true or false question, then the answer is "false."

It is false that service was the exclusive responsibility of the Post Office until 12 August 1918 when the United States War Department joined the Post Office to furnish the planes and pilots.

The truth is that the US Army had supervised for three months the operations of the air mailing service. It started on May 15, 1918, and after the successful operations and barely any incidents, the Army left and gave total control of the operation to the United States Postal Service.

Planes took off from the Polo Grounds in Washington D.C. and Belmont Park, in Long Islands, New York.

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Explanation:

JUST ANSWERED THIS QUESTION IN APWH B.