Another big factor, along with the insurance/pay, will be equipment cost. If the airport doesn't already have the AIT's they will have to BUY them. And MAINTAIN them. These are not cheap machines to buy, let alone to have techs from the different companies coming down all the time to do routine maintenance or if one breaks down. The airports that 'opt out' will face HUGE increases in their expenditures, that will have to be borne by who? Either the local taxpayers, or b*tch enough to have the Fed's step in and 'grant' them the money, which just means that ALL the taxpayers have to pay for their grandstanding...