The Kalskag Controlled Use Area: the area consists of that portion of Unit 18 bounded by a line from the confluence of the Mud Creek Tramway and Mud Creek, northwesterly to Russian Mission on the Yukon River, then east along the north bank of the Yukon River to Tucker's Slough, then along the north bank of Tucker's Slough to its confluence with the Yukon River, then along the north bank of the Yukon River to the old site of Paimiut, then south along the Unit 18 boundary back to the point of beginning (eff 07/14) Closed to the use of aircraft for hunting big game, including the transportation of big game hunters, their hunting gear, or parts of big game; however, this provision does not apply to the transportation of big game hunters, their hunting gear, or parts of big game by aircraft between publicly owned airports