Franklin Roosevelt actually said...

Possession, control, and operation of any transportation system... shall be terminated by the Director when he determines that such possessi...

In time of war, the President is empowered, through the Secretary of War, to take possession and assume control of any system or systems of ...

the exercise, as hereinafter specified, of the powers vested in me is necessary to insure, in the interest of the war effort, the operation ...

Flights performed within a period of 90 days prior to the date of this order shall be considered to have been made on the effective date of ...