Security
We all know the plan as presently published will not and cannot stop a determined bomber. But rather than offering criticism, herewith something constructive.
The authorities need to position armed security guys at every GA airport in the country, (OK it may need at least 1,000 - probably many more) and no aircraft gets airborne with out individual security clearance. All off-airfield based aircraft to be positioned to an airfield for the period. Then we can forget all about restricted and prohibited zones or the useless Flight Plans. Having said that, nothing ... absolutely nothing is going to stop said villain abducting a pilot's family member, sticking a gun in his ribs as he speaks to his loved one and then launches off to some obscure landing site to collect his weapon of choice. An MD 500 will happily lift a 1,000 pound GP bomb, or an R22 used to pick up a tea-cupful of Ricin.
Secure flying to you all out there. Dennis Kenyon.