While airlines share the cost of passenger screening, they also share the cost, through their taxes, of state troopers.

Aviation security officials failed to expand lists of people to be excluded from flying or impose thorough passenger screening.

They have also ordering more intense passenger screening.

The agency this month introduced new procedures, which included additional random passenger screening.

Might it rather be a panacea for the more costly endeavor of upgrading passenger screening?

In 2009, the government proposed an immigration bill which had provisions for passenger screening.

When passenger screening began in earnest in 1973, the government left security in the hands of the airlines.

What can the U.S. learn, if anything, from a different system of passenger screening?

And 9 of the 19 hijackers were flagged for passenger screening but eventually allowed to board.

Under a new law, the department faces a year-end deadline to improve passenger screening and baggage inspection.