It is overdue for the U.S. government and airline carriers to seriously consider adopting some El Al Airlines security policies. Qualified, trained, employed law enforcement officers traveling for business or pleasure should be given reduced priced tickets for training and joining airline security measures during their flights.
These unannounced officers would carry concealed firearms on their flights performing as flight marshals. With this measure in place (assuming that our airlines and government agencies have the acumen to regulate this simple task) prospective hijackers would be out of business.
The tons of equipment and regulations in place are expensive and still leave a lot to be desired.
This may not be an original suggestion, but the public should continue to bring it up until we do something more effective and less expensive.