It has been two months since Kenny Jacobs was appointed as executive chairman of Manna Air Delivery, the Irish-founded commercial drone delivery business. So far, he has been to the United States six times, where the business has shifted its focus since pulling the plug on flying drones in Ireland last June. “It has been fascinating,” Jacobs said. “We had the California gold rush in the 1840s, and now we have what I would call the Oklahoma-Texas drone rush in the current decade, because all four major drone companies are going to be in Texas and Oklahoma. “All are expanding…