My former airline did a gear down ferry from DXB to Europe on a 742F many years ago; I happened to be in the Ops office at the time and heard the Chief Pilot discuss the flight at length with the operating Capt, offering advice and going through all the limitations. Believe it had to stay under FL200 and max 270KIAS (IIRC). Fuel stop in IST; took all day but it was necessary mx-wise to get the aircraft home.