If I remember correctly, the 911 hijackers started in small airports in New England and flew to Boston so they didn't have to go through tighter (for that time) security there. When they arrived in Boston, they were already inside security.
Oh, I see that the TSA plan would have the passengers from smaller airports without screening go through screening at the large airports when they arrive. So this plan would not decrease the number of passengers screened, just move the screening. Kind of like rearranging the deck chairs on the Titanic.
Does this mean that all checked luggage from the flights from the smaller airports will have to be retrieved at the major airports and rechecked?
Incidentally, the bomb that brought down Pan Am 103 over Lockerbie had been checked through on a flight from a smaller airport to London and was put on the 747 although the passenger to whom that checked luggage belonged did not get on the flight.
Supposedly, TSA has fixed this problem so that no flight will take off if someone who has checked luggage is not on the flight. However, as we found out last month, this is not always the case. We flew from San Diego to San Jose, CA on a late afternoon flight. Southwest has flights between these airports almost every hour and, because my partner needs assistance getting to the gate, we arrived extra early. When we got to San Jose, her checked luggage did not arrive on the carousel with the rest of the luggage from our flight. We finally found it in the "unclaimed luggage" office; it was there because it had come in on an earlier flight, before we arrived. Ops, TSA.