This is another one of those conspiracy movies, only this one involves helicopters that see through walls (we've got that now), listen through closed windows (we've had that for years), and are armed to effectively control any situation.  Roy Scheider is the pilot cop who comes to term with the new beast, bests the bad guys, and saves the country from itself.  Many of the flight sequences are outstanding, though the dialog frequently sucks and makes the pilots seem stupid.  This is one that is worth sitting through every couple of years.