Airspace is at a premium during the convention. Every bit of airspace is assigned to something or another. The helicopters operate in a very tight box that is carved out of all the other activities. There is no room to move the helicopter route without interfering with other operations at the convention. This is looked at every year as part of the review of all air operations. The forum buildings have helped, as compared to the tents they used to have for forums, and the helicopters do not fly directly over the forum plaza, but rather just slightly to the west. It's about the best that can be done under the circumstances.