My research indicates a fleet of these crop dusters is not required.
Just one. Like the one now missing.
Anthrax is not detected unless you test for it I believe until some number of days after sprayed. Then the window of opportunity to administer ciprox is very short. Unless the government prepares with massive quantities of ciprox, rapidly implement our ability to test all populated areas for it daily, then we're leaving ourselves wide open. Does our news media even ask our government if they've done this? Does our government even bother to reassure us that they've done this? If they would, then they'd discourage an attack.
Oh I forgot!!! It's not compassionate to think that evil could exist in a human being like it existed in Hitler.