Citing improved airport security, military leaders plan to review air-defense policies put in place following the 9/11 terrorist attacks. Dozens of jets and hundreds of fighter pilots remain on constant alert against terrorists who hijack a commercial airliner or smaller aircraft, but such a stance is extremely expensive at a time when the "ability of terrorists to do what they did on 9/11 has been greatly curtailed," according to Maj. Gen. Pierre Forgues, operations director of the North American Aerospace Defense Command.

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