No person may operate an ultralight vehicle in areas designated in a Notice to Airmen under Sec. 91.137, Sec. 91.138, Sec. 91.141, Sec. 91.143 or Sec. 91.145 of this chapter, unless authorized by:
(a) Air Traffic Control (ATC); or
(b) A Flight Standards Certificate of Waiver or Authorization issued for the demonstration or event. [Doc. No. FAA-2000-8274, 66 FR 47378, Sept. 11, 2001]