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Why have retrictions on aircraft types such as Antanov (AN-12, AN12B, AN-24, AN-26, AN-32, AN-38, AN-72, AN-74 or AN-124), Boeing (707, 727-100, 727-200, 737-200, 747SP, 747-100, 747-200, 747-300), Ilyushin (IL-18, IL-62, IL-76, IL-86, IL-96 or IL-114), Lockheed Martin (Electra or TriStar) or McDonnell Douglas (DC9, MD-80, MD-90, DC-8-50, DC-8-60, DC-8-70, DC-10 or MD-10), Tupolev (TU-134, TU-154, TU-204 or TU-214) and/or Yakovlev (YAK-40 or YAK-42)?
