Assuming I agree with your premise, which some might find deeply disturbing in the context of government, doesn’t it seem shady that this one for-profit private company is deputized to offer this service? I too want to know the terms, and at least whether these contracts are up for bid regularly. If I were the negotiator for the government side, I’d feel obliged to cap subscriber fees as a condition of the deal, and also to encourage multiple companies to compete for the contracts on how much of the revenue they’ll give the government/airport. The lack of competitors makes it seem like a sweetheart deal.