The validity of the flight approval in Item 2, 4, 5 and 7 of Article 2 shall be twenty-four hours before and after the estimated time of departure and arrival as shown in the flight notification (see attachment 2).Attachment 1 Civil Aviation Administration Ministry of Transportation and Communications, Republic of China Civil Aircraft Application for Making Flights in the ROC.pdfAttachment 2 Notice of Civil Aviation Administration, Ministry of Transportation & Communication, granting permission to a flight by civil aircraft.pdf