You don't know what is and is not economical. Pick a price that will reduce average taxes on affected citizens enough that they are indifferent if the flights occur or not. If that price is too high to make the business economical, it will not occur, which is economically efficient.
Should we place a tax on murder? Certainly there's a payoff at which point, 50% of the voters will shrug their shoulders, and say: "Well, if someone's willing to pay 5 million dollars to want someone dead, surely they've got a great reason to... My property taxes just went down by half a percentage point!"