NEW YORK - May 24, 2008 - On a cloudless spring day, the New York City Police Department helicopter soars over the city, its sights set on the Statue of Liberty.

A dramatic close-up of Lady Liberty's frozen gaze fills one of three flat-screen computer monitors mounted on a console. Hundreds of sightseers below are oblivious to the fact that a helicopter is peering down on them from a mile and a half away.

"They don't even know we're here," said crew chief John Diaz, speaking into a headset over the din of the aircraft's engine.

The helicopter's unmarked paint job belies what's inside: an arsenal of sophisticated surveillance and tracking equipment powerful enough to read license plates - or scan pedestrians' faces - from high above the nation's largest metropolis.

Police say the chopper's sweeps of landmarks and other potential targets are invaluable in helping guard against another terrorist attack, providing a see-but-avoid-being-seen advantage against bad guys.

"It looks like just another helicopter in the sky," said Assistant Police Chief Charles Kammerdener, who oversees the department's aviation unit.

Police Commissioner Raymond Kelly has said that no other U.S. law enforcement agency "has anything that comes close" to the surveillance chopper, which was designed by engineers at Bell Helicopter and computer technicians based on NYPD specifications.

The chopper is named simply "23" - for the number of police officers killed in the Sept. 11, 2001, attacks.

The $10 million helicopter is just part of the department's efforts to adopt cutting-edge technology for its counterterrorism operations.