2. not brought into operation within three years after the passing of the Act (or in the case of routes affected by the war with Japan within one year of the end of that war whichever is the longer period), shall be treated as an unassigned route, the operation of which would require a licence. (See later). Provided that if upon application made by a Corporation to the Tribunal referred to in paragraphs 7 and 8 the Tribunal is satisfied that for reasons outside the control of the Corporation, it has been impracticable for the Corporation to bring a particular route into operation within the abovementioned period the Tribunal shall have the power to extend the period within which the Corporation must operate the route in order to retain it as a scheduled route.