SAN FRANCISCO (KGO) -- A low-flying helicopter was spotted near San Francisco's Union Square early Saturday morning.
It wasn't a movie shoot - but a lift job to hoist HVAC unit on and off the very top of the Hilton hotel.
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The specially outfitted sky crane is called in for the most delicate jobs.
Twitter users posted video of the rare scene online, at first thinking it was a rescue operation or a film shoot.