1.   A more useful adjustment would be to improve pay and training for airport guards and baggage scanners in order to attract workers who will do their jobs well.

2.   High-technology baggage scanners in use in Atlanta and San Francisco are also considered expensive, costing about a million dollars each.

3.   Baggage scanners have also been added since the attack.

4.   The observation deck reopened Tuesday for the first time since the shooting, with additional security measures in place including metal detectors and hand-held baggage scanners.