So, the Advanced Imaging Technology Units(AIT) that the TSA are implementing into Airports may be optional. At West Palm Beach(PBI) Airport in Florida, they were optional. They had the new machine and the old one side by side. There was sign in front of the AIT Machine saying that The AIT is optional. You can choose to go through the new one if you like or just stay with the old one. It also gave a brief summary of how the new ones works. So, maybe the protest did work or PBI is just trying them out. Did you see this in other airports?