A key threshold of security always has been the pre-board screening, and that's the opportunity to screen the passengers and their carry-on baggage. We have installed a very expensive and we believe a very effective electronic system to detect checked baggage screening. It ran in at over a billion dollars Canada-wide.
The threat has changed over the years. The fear was a hijacking scenario, and now we're particularly concerned about a use of explosives to bring down a plane. The threat changed when terrorists wanted to make political statements but still live, and flew the planes to Cuba; now they're quite willing to give their lives in order to make a political statement.
As a consequence, where we didn't spend a lot of time was on the search of the passenger himself. We did the walk-through to detect any kinds of metals. Most bombs require a metal, but there have been some bombs—I'm supposed to use the words “improvised explosive device”—that now don't need to rely on metal, as in wire or a battery or anything along those lines. They can be detonated by other means.
So we're fighting a technological battle. We close up one hole, but the ingenuity of mankind is focused on the other side, and they will find additional loopholes or problems that we're going to have to continue to deal with for decades to come.