A montage shows a man dropping a letter into a mail bag, men loading mail into a biplane and the biplane taking off as U

The transcript discusses the inauguration of airmail service between New York, Philadelphia, and Washington, witnessed by President Woodrow Wilson. Due to the war and uncertainties in nonmilitary airplane deliveries, the post office collaborated with the Army to initiate the service. However, facing potential shutdowns due to a lack of pilots and planes, the post office eventually took over the service independently.

What agreement did the post office make with the Army?

Why did the post office take over the project on its own?